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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 0x0c5d0e228748dc499becc04b5bab76ae8662e9c7ce60a82ee9680bb0c7b4075a. 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/5a79d12c-7035-4bdd-b84c-d6f09aee3aed.json and https://artists.proofprofile.net/proofs/artist/5a79d12c-7035-4bdd-b84c-d6f09aee3aed.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 0x92fc4db127f0da0fad5b4e445849694d7fff510f47a1ba02415dbdaa571a4277. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/NL1AP1800185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd060abd60f4c4accc48c0508116c8c74390a5423f0909f3ccba943541df47766. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/NL1AP1800186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3944cb604e4e08aec610b4b886d9de178b333e73c7a3b44af5e9dd62075ffcc1. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/NL1AP1800187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0762cdf4505b91312697a7db31f15c235c12d93edaa58b4545f1fa7a9d5bad46. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/NL1AP1800188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3051d26294ca380cd97a667c96e744ba686bd30f7a414358be05b2b1a6f91d3d. 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/NL1AP1800189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea790630068d1748306ff5a29c6e581ce9fe241bf4f85f369dba9125f76a73c9. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/NL1AP1800190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae170dfa5edf39aac4d2c6b05b8fe5980541a7ce8c1abf3013002cf97d23f100. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DELJ81937689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08425f1c51a9c4d3e9e4204c33919ed85964e565712a80c081fe27c17102a68a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CH7812054040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95090758640609429ad8f5545a01e73f178f39828f239ae4cce3ca2ce14d7c31. 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/CH7812073540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c3ad225598b92bbc0d6fa60f49ec5feb078265a9e9f4054b13d3bdb417a7351. 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/CH7812073541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768f71f4b3beb13c03f08d4cd2a07a1492f3e00c71c0d5ff91ce0975d8f8f34e. 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/CH7812073542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e6733a2c24e166fb9f2457139a47a7281cd8a1c5a4dcc5bad9cdce712d5504. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CH7812073543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf043cb6cd69bba6ec26d2698abae6b338f944c5ac82a0d90bc2f9f1589593fb1. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/CH7812073544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4267c922e5cf5aafe425f0e7b1e8a3c585b087ec0a8bd2846be16863b99cc2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CH7812073545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfccd1c7c587800e392e55e2946ad50574f6774682c3cec64e3ff1ea9ddbde7b. 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/CH7812183130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f554c4285841cc440c83dbc8eecbb2ce3ec6b6ccb3c4e8cdcd381dccd6a5c0a. 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/CH7812107667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfeb280bd44dde6e6428c629e67a06e136a519430c3cc1650a7d4983bc3f8be. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/DEZC62411945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911afc55ff451cb3215b033faff59bf8569544daf283fddd62d824f7764a45b9. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/DEZC62418233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01fb3a682c6d56331f218eeff0852f882f8e19bd0ea1f1ff25e71b0cfe67cf66. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DEZC62442578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ab715697d4e1cd07436641a5ceaa0f24a7c8f959b3abfb8b3ed3618761bb6b. 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/DEZC62122948.