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 0x924ba2778d8c08c9eeb05584fead6d1ee22885dddadbfc6203cf2c08e4c16ee5. 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/adee6f3c-3c01-48f5-a2b3-c9b03ad06aff.json and https://artists.proofprofile.net/proofs/artist/adee6f3c-3c01-48f5-a2b3-c9b03ad06aff.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 0x763845a197d9303f01eb5ded1b70930d13d53b2c3eec74094ccbf475dd83bf72. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:56:01Z), 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/AEA0D1929162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd949b6cfbe9ddf59417ea477a0c57ce6ba1226045d429b0de628c23aba774584. 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/AEA0D1929163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c1e12d6fae5db7ba5bbac6bc01723c205ad659acb6160a48c2853a91081b74. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T21:33:17Z), 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/AEA0D1929165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5740055a4db452048314dcf9e767d71d38e98436772b5cfa59d750adf73703ab. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/AEA0D1929171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38d8813d5480e2cc0a69dbe048d2d69ca21cfea7195796ec010436bfdf3eb92. 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/AEA0D1929172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a463feecae5ba58bc4712dae27fffcce6d62e02e1535f8545592ddbaf7d215. 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/AEA0D1929174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c545f783dd41641571ad6006d50ab503d1ed236b45c04176417b6168cf2d89. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCACZ1791383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c87c4d1cba8547307d788de37a74a598a1090f311791db981f8d8c487e0f38a. 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/TCACZ1791398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce50457e1c7a88654b47eeca2a50abdba94e3627939544a0e00585048638ea8f. 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/TCACZ1791403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ba9f8d1e5bfb08a9395bc45f8261fc9d208fb0652b0c9b273b13e9c64482fd. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/TCACZ1791422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7e366fc22a6ecfd0377fe2400caaaac4363c3c979518729234ab1380949902. 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/TCACZ1791442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45217e113d398349f5e47a3f75b96b1edca802af1d53743a2ce6a92b6f958db2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCACZ1791462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d35826c293b2675e43aec849c784705f2f3d8d32e6959866998d856f95dbe8. 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/QMFME1935316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ca29e625fa783b764b1716a84cbcd355f851c25b36b2492d041d26328b79bb. 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/QMFME1935320.