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 0x37933a4420dcf11741a9bd06e8772d6bf90459ec8890ce1e5c4e171ca496b609. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e453d6b0-33d1-4dc4-bbf7-42962c2b653d.json and https://artists.proofprofile.net/proofs/artist/e453d6b0-33d1-4dc4-bbf7-42962c2b653d.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 0x5bc0c79f9c073b51a983d235e17049de04220e07bea2359cb5ca643e0955d67f. 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/FIYD92100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc542001224536375fca9bec2cfdd0bd39363d8add7200a7afd322d88dfbe1e11. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FIYD92300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ab0d60e06cf598e9d1965d90ffaceb1a0575ebc1755808b79404aa01ee77ff. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/FIYD92400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728af9aa1a9383aba195d3f7366c4c9065a8c4726c75482c7122cb3df5e2b818. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FIYD92400033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f377edf874eec9b8073bd854438e0ac679e30f7d499bf468f4e8f33eca95786. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FIYD92500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef87f1da9991c01e91b84c1e8d4849680a780f223bc3888749656345af8aca81. 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/FIYD92500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763d9ac5127b607747248e84d29896cb5613b0e30b83860f0be98723931d8b12. 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/FIYD92500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef71155dabbc3a4f21fddf8ae9004a7dc69f39a38c823635c8e24c95c51573de. 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/FIYD92500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b68df2390e068cf94b0c9fa5ed16f741c8338c561d65218a8b314192e755ed8. 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/FIYD92500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61039d64a68aada7a341a61f0a7bb369a746d6374e0bd7ae2c45b52adec711bb. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/FIYD92500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523a3b52872865b07bdedb0ff9d2be732c31998fe1a418c74ccebc792f45790d. 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/FIYD92500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e586370b98b52e3c26ce24a34bb1137073917fd411a4d145ae7ddfa5dfd906f. 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/FIYD92500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2e51d0f45205aa71f8712a8b222bd9dec11203604e0821395de7c34ee44b2d. 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/FIYD92500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9033ea96e112d2d08f2ac6097f3a2f16943f9e9dfa34db43b118b196013895d4. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/FIYD92500014.