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 0x9a666911484422aa73e6eb6644653824a47c5d3966bf5a641362fdd99b8a3098. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/efa2c0af-e363-42e7-aeba-aa4bdb218b04.json and https://artists.proofprofile.net/proofs/artist/efa2c0af-e363-42e7-aeba-aa4bdb218b04.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 0x59362adf997a687215be1a1d8f3585f654ad8116123ed9ae254208fe6d6e054d. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZ22B1853388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7d4dad2330852a4553b95c65cb734a3e6f84ea394914ef0502290694ab6072. 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/QZ22B1853391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91dcd8ed95a58409cd162f6c7ca7573b7ca75c67625c37314a01b5f95b4d067. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZ22B1853394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e0b8b04bc3a95e35f50ebf81cd5d83360295f3dbd105b05bd7b9755a196e75. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZ22B1853397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfea395310106755829eab11e12054a70c063a2fa5d45334de4258a5d9ce511b. 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/QZ22B1854193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc4eabdbf2b8cd1bd54ae8221b973fdbae0f73506b5573b4d7638afe715939a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZ22B1854197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519473a8aab7471238b3ab5d75c960219bba704748df20f7f8928bf74300cd79. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZ22B1854198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd54239041746fd3a03a3ea00533d798cdbe2f8f5aed151be45179ab1f9a323a. 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/QZ22B1925573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424a4027de3cb41256c3f45f35c21137781af57aa8d2618ed48eb7ad439f443e. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZ22B1925577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a59526ced1bcd81429b3dff7bb09b99849cc55060614ccc1c3f05b903af802. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZ22B1925578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ae80bc7c20f069788d7a1491e6611a281b5ed271391e446e187f109d6019c5. Chain 2 (Bitcoin): anchored in block 958654 (2026-07-19T03:55:30Z), 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/QZ22B2003428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328aef3660e46fec38942c92a213ec88bae16c9c657b4b29a580c141b9142d9c. 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/ART0G1808691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e8d7f9a71c92baf790c54a9006af361e3d13c13b21d67afcf14d097349815c. 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/QZWDE2539462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a841afdb3265affef8a4be9b5c5c74e26b738d06c428b5853d93dc85e708197. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZWDE2539464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d668f4d784d8cdbc30799bb73d332a738c385547cb0b5db14ea9c1a6fd7e9c8. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZWDE2539465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0aa1ad3d822eaf882e74d437b2638fc28f57f0c2982be2abf59355dc4229933. 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/QZWDE2539468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0cf95fd1c905f865b67a63baabd06c907eb79234b14069b0dbd2674c9757267. 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/QZWDE2539469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6228dd0ca4481fd20c916bdab49bf61ca8eedd2ee67e4a175ba63a42f2753092. 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/QZWDE2539471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa661e7d1a63f2899b264801672299a5fc487228aabe010167fa6158b318d7231. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZWDE2539472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cc1563e2d73f099943a4650087e2f00fc14635b6bd7c0684aab6549d270c8f. 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/QZWDE2539474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa08256f8b8c28e103cb33b701268b32231c46d202f54971c95a048753359a093. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZWDE2539476.