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 0xfd54ae657ac1316f929dc82abf99e41c2f0364cbd6f60b39d92c60d506d064be. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c3443d0-9be2-4978-9794-93385e355e7d.json and https://artists.proofprofile.net/proofs/artist/3c3443d0-9be2-4978-9794-93385e355e7d.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 0x4e844df289fff76710b4d9847e1fd4fb0240669e8dd5c29b03c8ec19237081b7. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES71G1859663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcfc6814cd2d2ccba24d0c4d84b135643a1721356692699d1d38324e32538bb2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES71G1859667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c46009e148adf35a61f316320a044345b0a8ca0f0d12b2d24e312ed9663adb. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/ES71G1859670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821a342ff9c646384bd4e4ca3c96256d0d7a52bfb55066e9b490613d6dd2e80d. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/ES71G1859699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7587eeebce2ccb6ee4c8ac7795e6dc63cd35abd5c432380e4a5a825067c92e61. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES71G1859694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c3a631e0bc1d5b711df7e00ef185858fd0fc33645e3eefa0e8a5a84ea2ff56. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ES71G1859698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa569b3f29759079ccfd4994408535ab9f98ed56cd94b26d764920b5250c2d532. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/ES71G1859700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebba6ef30f0c8453ca5a846341c9264fc3a7c72f94b58e31dfab8d039a09659f. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/ES71G1859702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e0098c1bb7c168c60c7e2a3a11d1fbf13d2d00c6c81948470b97884a85390f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES71G1859654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3c1c1a137234cdddcb93b704afda16c526f9c8418453912cc0bc202a2155f8. 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/ES71G1859652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9b38458b79f66b0653ddcddaea452ae862813186068d933fbebb335f20006f. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/ES71G1859659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5946ecaa90fb7f97c294f265bd5c6de70b066b75f448aeaead8edcf66b5097cc. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ES71G2043797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747f2fc4e6b8196a0b5b89034ee7d14cb325a5ac85acd3f1345a1f081653f047. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ES71G2043800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6eacc0d8b4697a76db0366a6ac0f8c3947a6988ff4ed34e2a7f884efc81ce06. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES71G2043802.