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 0xe01e3db8b26d0155a7b496995ed829172a5d7106b8956db9f828dd1fea8576a4. 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/a07137f1-061d-4b51-a074-62004fa683ca.json and https://artists.proofprofile.net/proofs/artist/a07137f1-061d-4b51-a074-62004fa683ca.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 0xf8d08c3751e18425e858992fc36cf650d0fe5263d55ffe1faea9f7440e6ba63d. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCACG1545385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a15a076d0eabc7c775f8873a3f3df6ada84beded0ad8ffdae3be6f32883de2. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCACG1545386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aeff69aa1f8d1914e83ab2a35857e79abe4fc01e20e1411406aea1e534a25fb. 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/TCACG1545387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcd55220158a99322e0e9f2e23ebc357eddcb9239492e76f211577cf1ea0071. 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/USF289801675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf651b6667cb136687c4068bf9737676807e71d2591c9012d1f7d88a132f0045b. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USF289801676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e242700ee82e2892a9f072c5bb54eeb5cad1df4a8276eb87ca42fc60c1758c. 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/USF289801679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1216c564cc76cc041430ba998c74130597970988b37d8657a6e1a14c448009. 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/USF289801684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94dc7893d27135737b5eb18dc6c9abd63a4fdbe854ee5b8d5ca586463f1a564. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZRP52283812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c1f906073d5c48a4779f28e71b892333dd4b78b3963e73da8ae7b4da163a73. 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/QZTB22298882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4e83781e5ad1bb1e2fb5381f298fc972606c1e88954fcbffd7e6c13de8d3ae. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZTB22298883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc11c7b64004141587b8f7a63cb6532ab1ff8880986df8e0328c980738f7a3d5. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZFZ72506111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee0a9c1b6444feff24a8f1f5f982d5eba43c5163f6d7c576b0b0d0fc4ad7625. 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/QZFZ72506110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d74de3fc24e0bccef58d14b173e6dde483b6bc40c3b63d56ee1b267113db7f. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZES62571934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac9bd1d3e3e306f0629b1a193705bb2e21d3c29f83c2b4901c20b0581f0b9ea. 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/QZES62571935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35c5bc72ce98a029a1768778929db2778fc0c18fa558f1594f8bc984d543e0b. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZES62571936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd483cd5b22e3b2e15d738719eac183ca241c41f2a1394554073b408afeda46b5. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZES62571937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc11c7b64004141587b8f7a63cb6532ab1ff8880986df8e0328c980738f7a3d5. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZFZ72506111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43312dc86f89ec3d73f65f44e0f358070001d6e40c828170b0ba5af4cb0a476c. 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/QZES62571938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26d1cc3df645cf35e0a86b2bc42b44c25ce379a8a988f6ed67968c44260a58a. 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/QZES62571939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28b1d2301e4c27b56e952dbb1590bce3e28c574d8ee1920e0722516e65e67ff. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZES62571941.