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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91bc44323e834754f01b4b15d0c345a0cf12f60c2a92f5bc86b4f6f801cedeb7. 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/4c1cfab7-b0e6-4d9b-a387-5eb1488efbde.json and https://artists.proofprofile.net/proofs/artist/4c1cfab7-b0e6-4d9b-a387-5eb1488efbde.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7082e3fb5f9390de0f9a44e19711dc5442679a06be5b70cf3e91d45b479b4c5. 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/QZF8N2161580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637967104ea49b7959ebc6ece39fc0d24b35189254b538fdc8439ca9edbeff03. 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/QZNMW2184764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b73d7be31d0c1790d8dffbdc63b0511e14c6c6ddef6451c401e7e861a4bb23. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZNMZ2119718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ef8369779c985a3b344955660623364166e243c605967eb75d301044d695ff. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNMV2252906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa18e97cc807d219682fafb97218802ac43efed62ce2f46fe612c9196aae20d1. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/TCAGQ2225400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8f72f0ad00ff4db9c548aec9ba5e23f56d0c979ca4cb0496e9e5470adbff03. 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/TCAHB2320503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3f49258e2c8a4458c6c97d837c4f23afd0473bced414d5778d4164a7185739. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAHF2303535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0d85497594cac13ffd7ce79a55c0ef9c27aaf3df56df6f2da021a4c5dcb500. 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/TCAHF2303557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3ff0ebc2126df48cc9f2bbbd0b9607184213ba599385bd61b5b845ec0a8807. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/TCAHF2305963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7cf4609273a77bd15a0b05c75d29204f7f5ce2259d78de2cb1694699c2262b. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/TCAHF2303583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487e162a461da215bb271ad95c50704ceaf0f25f092d0045a5b212ffaeaec0cf. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCAGS2398920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97067ec45af414ee5f4b5136c1898951fd5b9a7f7365fe82dbafe07f83d79cd. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/TCAGS2398934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d0ac9ea67e1fb46327e258a3861bf62c185d8bd8397d9d022e67d05c0b83dc. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/TCAGS2398973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c18745a2c691bad4b150d712eb55053fd7ee9e1ad17e2848ad0c9803d9b987. 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/TCAGN2281157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485a396b20cf97ddf3569026a644d745440887c64388462196d5f6c1a69efeab. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAGS2398942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210f14ebdb04945ac202d8ad0527af9067c1b5be0b57bff940fb174a99ae472a. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCAGS2398967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2ae307ea5e07695678b2b695315e3f87281f4062843271cee9f7a08b818ee6. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/TCAGS2398982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e8cc1ddb1b6bf0a7af0dec3c91e86d66630a3b846392b7c1fb6458e2a00483. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USLUU2301767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd932d16ebaecef55403f16836f0eb3a74affed2d2b58e2a157cee862fae89885. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/USLUU2301768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72b508f359978dbd213c2a15d1a57ec7544b1df8bb0de7e786a1dacdb8933c5. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USLUU2301769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0825be6493ea778553eb9d8eea0e087ad1dad82eecf2d576e89f27cdc4995ba8. 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/USLUU2301771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052a4241abc51f2706a1356995a30c0f73802fcb61cd910214d77977502d21e0. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USLUU2301772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7156c62f8e0142fae81b99dae6a731ad25b88dcdbf69d07e55993164e7c90743. 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/USLUU2301773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fc26a2684f62d793fce3f2058078340ddcc3ae9d630ebd895161f16bbd214b. 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/USLUU2301774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57288863ffbb0a4c1bbae548aee1679e4ca3f4c6493b4c57a8b635b1ccb7226. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/USLUU2301775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22dc09cfd17de050b5b2ddd883da374bbac2e9483563d298db259975a4c2694d. 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/USLUU2400531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ddb1089c2cb3c1009d29a45ccd6fa426b86dfa23784b086401e2f8e3f0b8288. 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/USLUU2400532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c71e61ecf5ae5f91d14150bbd06a9215814ba55c0c8abaf9b4f6044ad4910d. 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/USLUU2400533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440e2b3f19e1e71c56033ca350c1986ff529b2dd5ee58d572c812da5f36a26c9. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/USLUU2400534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b92e134a66222c2ebfa629e3dad4d87e4449b6df57f6d88809dcbb6c2e5ceb. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/USLUU2400535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24050767b3c9b165104a2ff47858e03d96580ee2e4a89bc761b537fac8874191. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USLUU2400530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba27c94c9a474c76bb0e8e3f4d093c53635f17fe01a98855fe59b09288b3c423. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAJV2517951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7e8d6d2f6e33a64c36d4b31659a96bf2c5f9c364c8d0855af60d24b571ae00. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USAT22200536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4f2d2a14eef139be4246ec2f9059f08da3ab5968a7f80bbf984b0fd66f989e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USAT22103207.