Haim Moshe (, , sometimes Chaim Moshe on recordings), born 20 September 1955 is an Israeli singer whose musical style has crossed over from Yemenite and Mediterranean "ethnic" music to include mainst
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c30d6e778759fa8b92ec5c5286952f344fe7fe5687f7dfa9a4943cbdfb9a18f. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/220e0cb6-31de-4b9b-86dc-daa07200655f.json and https://artists.proofprofile.net/proofs/artist/220e0cb6-31de-4b9b-86dc-daa07200655f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6b9d9677c952295f24fc3be37c0782d1160a265d8a7fa80f82cf396b43e296. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4b0d58bfc84ae0f0f021ebba2f868486686bfa9092fb0c9a6c33896f2db5ad. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:20:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848401932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02cb62e37e5f6080295e7a5b09770099f356451bcd8f1623a216150d08572664. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5849200875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12301e60d5754082d0b8b2a462f285f9c393ce71bcda3fd7b80757493a233aa5. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ea1ff22aa56848f33f44db3dbd57813e95f608e71e10fae75a66f957fc848a. Chain 2 (Bitcoin): anchored in block 957569 (2026-07-11T12:44:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb437a668b97e404a8304eb4d3d4ae5745294e7e73cfd3958197c34b8f0e41c14. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2449bad33eec78f4b485dafa5c2c016d97eee82fa6b1c3b8569f42285c69774e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb895fb362a1b41cca59c20543fec4f07c36ef0d9adf959b75db19ffeb2b14b35. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1002fccb5f08b64ca27de5c2dbe54e70e9ed41df4e8f5293cf5c683d0aab7d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848701915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05eb1426be848208554e6872cdfe7a1000dac5c149e880564a60bad0eaff83f1. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec442046384d22188539dd98326cc7208622e4dbbf6d86f2c8c045077aa84e51. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10da65c54ae6bf65973a3ebac4b8ea7eea9b4fa0c759c6d617c8daf17ec720b2. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb895fb362a1b41cca59c20543fec4f07c36ef0d9adf959b75db19ffeb2b14b35. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400485688661e1e5b9cf2b080d7cc98022f08b85787a3da3875290f1cc704464. Chain 2 (Bitcoin): anchored in block 958204 (2026-07-16T00:20:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc47442c3fa479088295b8173ecd5c7abb7acfc8fa303e7073c1e6fbad03e6f. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e862f418a0cad848cce899d838e01cef9afdc2c38788d18c861b8c2f5bbb455. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848900899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7957276a3cba446b1d90525c9c691629aedbfdb097d1ca86151b6cf5959865b9. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848900896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2541858308b026c303b065656d406a09533bacc012d8539baa870f02314da556. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848900892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693c65e176378ddb97d30a334750cf1ef3e93831e1440adaa402421e4ca14543. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5849101905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94edcd30a7fefe058a83a926058a73d5c74e7ce6c01bd99c3049f9893591fdd3. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5849200885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55591a73c6745911075b8b68ab8d779a949db97a280bfffbfd5ae5da856d0f2. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5849401950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b58440af058dc2b1cdcf38619c58d35ac65fdac9ba6fb48313171ca26a46129. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5849800833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf68ef487998dea46687ca172303ae8b4b4ecc0799c2b8b0b60b3afb433f57d. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5840101920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ac452f717bdf8f3e34b631587d8b87bdd6add44756062e9b29a75767d70db3. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5840507888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0baa63c94742d6051b844f7afcd1acc95861534a9b75dfee6b138a9f05c65553. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5841307629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aca26ab312ba3ab7aa5c09a1a2f09a092bea0c681c9a91290842b5633de626c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T14:33:31Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848501917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e400a4a6d0de30df9c06b39940465bcb79e71d71b0db06a1440336171708c6. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07f5376b47d7d60f9d91a741f5469717db61a51c5f9fc25517a117d68d54f54. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5849001899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe127f3cedfac30fa58b425d2e86a1ca4296a893ef53d19bd30baaf8541de6fcc. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5841511222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb437a668b97e404a8304eb4d3d4ae5745294e7e73cfd3958197c34b8f0e41c14. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff1bea372c3277c1612ad1deedf58e5e4213d208d594dc5a84b1a539f961265. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5841307630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152a86a5a117f04bed92e2e86203d247ed57659d87dc09e0056bf6174df1d0c8. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5841511223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72ba9a9eb8c74f25e173449136bdac7958ced2d3fe8b49cb2acfbf8392a4f25. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5841511225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f65acfd5712088c1c7feae3ceea3410f01c10e6c4a1930d06c559554e9be10. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5841307631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc3252fc81081150371ff83edda203f400aac1d8b0dfd09fc8a5f6dc26e10da. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5841511227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0baa63c94742d6051b844f7afcd1acc95861534a9b75dfee6b138a9f05c65553. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T21:02:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5841307629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693c65e176378ddb97d30a334750cf1ef3e93831e1440adaa402421e4ca14543. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5849101905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25aeb5b47b42a8ffee7bafd033359f8ccc51f334575f34ccfdd39175a869a44b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5848800848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff1bea372c3277c1612ad1deedf58e5e4213d208d594dc5a84b1a539f961265. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL5841307630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44cde5f444b9c91c337ddd3390b35bda34d6f8958d6e72980212a3886d86840e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1002100328.
עבודה עברית - מחווה ל-50 שנות יצירה מקורית
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42c343c855738dbe5f0e04726dfba7a08e71f87d162f940b1eecb73c2a3a609. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1049801141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9723362c76874f446346452d5c59f8cd7254d47cf033ed03263588206b62ca03. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/IL1011122814.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch