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 0x07a424ee11bdc4ba1bfdb4f92f8226aee64cfc5ce9d71af3fff7d13a0db7aaf8. 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/b42f0a48-3d82-4e85-8e0c-2760c89fb740.json and https://artists.proofprofile.net/proofs/artist/b42f0a48-3d82-4e85-8e0c-2760c89fb740.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 0x98d779c76268d9e275be992782dbd5ec600a3c3f9bc34fa1aaf57cb7c0bed138. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/INS181401916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30bcd99828ed1600d955e02e70973cb8ce89867754a103e303578a30eb3b292. 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/INS181401917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce425042c57e48d671afbb8de21ba19d992238633b4dc43e2f6205e81faee647. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/INS181401918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc747c3bddb9a4555bc07858b84488a31d9282f6f581cbef40625345a35106c92. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/INS181401919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2bdfedcf5cd9e6df679d72cd561fa7da0e3421abace4063a09b3c1398e7d4d. 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/INS181401920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c9d24dea335127b48137f81df258760161936f10f965538684a3a65a536817. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/INS181401921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846113403ba537867bc215a3c6198da7df9944123bdbcd6ec23c2d46863959d0. 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/INS181401077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f66f5f4b3cb1f86c30d36c0ca25450a41d0bd3c4a06273b1158d23842c0ba4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/INS181401894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe73660c4cc02aa05ed640ee9ed5dd860728f3992ad399b10fd2c4a634abc4a5. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/INS181401895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86c21a091c8bdcf7ea0ef9f5f543926a057f600b903aa42c7a995048413f604. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/INS181401896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7effa811fa0c58ea0d5b5247481caf3d66076392f5b4b83bb3bcdc8da0366cf2. 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/INS181401897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ac2e3ef017434624f78fc3b5d6a6d83c46997b092429d91cc8481cece3ee87. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/INS181401898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a34ba4d2fc05fbddababa69d8d69d9c32a0c987b7e6d86286fc0ffaf8fa9f2. 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/INS181401905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c6ad1737e560640d8381c7822560e56a8a11682c66e05202dbf81e87dd0f41. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/INS181401906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a982cf6a943cc2a5694ab5f823d6d98d46c006cf407dd3f679dedc4761de50. 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/INS181401907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d7b712b0011d2ca475c900e7577611a46e257caa01e4390966bac63da44d6f. 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/INS181401908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c22a73ba7fd794b6b59bc210d8f203edec4574d844ab76732d0d60caeb926e1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/INS181401909.