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 0xb391ff4abfdfd1748b16de3d7148c75610e68d6e14687b9e51bb19f83ef80d18. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da743ec1-2e78-4db7-8dc5-3473a669ad2d.json and https://artists.proofprofile.net/proofs/artist/da743ec1-2e78-4db7-8dc5-3473a669ad2d.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 0xb198fc1dfcac7569c67b000063b89881ff08cb86ba6ac180ba891d31530fede6. 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/TCJPQ2294700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca1700efe4798e88c3671b5f76db6cac6ef3fbcbb1e50f847bd89d36550d555. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/JPWP02300323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00dcad1db5d4f6b32e036b4bf3c43de9bfb509ddefd2aeff464acb8bb2ff8f19. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/JPWP02300559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd94d4333505225fc2428ea50c46612b00a98677badefa687837703f7d76790a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/JPWP02300556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a08c152dfe89ec2fb4e8ecc286b8a3092aa19807abc04a7ae4dd321db62125. 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/JPWP02300557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x269622aad3c9b5224ba4cd17fcb0a126c782384802a62a609a6261b2d533d298. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/JPWP02300558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00dcad1db5d4f6b32e036b4bf3c43de9bfb509ddefd2aeff464acb8bb2ff8f19. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/JPWP02300559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a08c152dfe89ec2fb4e8ecc286b8a3092aa19807abc04a7ae4dd321db62125. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/JPWP02300557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e0d7a7452de760b945b17cd3831d601699e78da9bc7f8b37aab09c9a3145f4. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCJPA2436924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f8d063b78f8fe65e320cc60efeb8c8d90936c3dd5d0fe628a79046f1250ba2. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/TCJPA2499598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1aafc0125fbbf81cfdf261505b9664614fd21c892f465f8c087da5675a14acc. 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/TCJPB2493278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226e40932b6156e191689d81993514453e8163019ce4050d51ae22fa00f630ec. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCJPB2493291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212d26e3b8dd9fca82db1da0fdd8881887edb0a46fb8a771cd5fe74d460286ab. 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/TCJPB2493323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3d0cf14551d55af264f33f826088c4f3d096af7ab8b8c3467812074489aafd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/JPS802353816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3d0cf14551d55af264f33f826088c4f3d096af7ab8b8c3467812074489aafd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/JPS802353816.