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 0xcd9400b2e27c126c47490f5ca0828662b24e4a930ac57ab65a43e1f7f6d71d60. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ab47f2d-7e35-4941-b5d4-b4c6b7342791.json and https://artists.proofprofile.net/proofs/artist/4ab47f2d-7e35-4941-b5d4-b4c6b7342791.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 0x7c5a0b3f6a800813d477fd62c8326a1e37cd9019a1b06225ffc86e4d408a9fbd. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZES62596502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67eb97b5bcb97740fb4705ce8d5c8cbf562af16f1fd5fc57afbf5fece662acef. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZES62596503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c77186f84f6b0d8bbe4e28633da507a5ef107034b313a48beb3f09c8eb2bed. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZES62596504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x037295fec133fefe9e67134cb57546931bcafc768a196218e4cf8ee852c5f2c0. 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/QZES62596505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55b964eb95a8d700752112953fb47c8e45572a058516b8c69392f0767e96b3f. 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/QZES62596506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c836a06b46b7aea5cd83e000ea62cd8676ab79b0881a031a0a6f8c86fb6dcfb. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZES62596507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced08b2ad5fbf0acd6d1069662f7efdaf2832703550db9bf640f6f40778d961b. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZES62596508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3835302e881a9d4ec1367d4c2ce7605e4a94c75c928382ee65848421a9105137. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZES62596509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81711c60d726d285c0bc2aea3c2c48f54fa4d38ace2691c1b5e9fb0a5208e02c. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZES62596510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c066b553c51071f3c2c4f2b22c631394bf5bbebc900ca2a1348bb9156c2646. 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/QZES62596511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf206c29fe9546d007eba1f373f27ee1e1dc788876a4a074326c7eb825cf50b. 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/QZHN62568351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c018bf6ed3e95bdd6b06c286cb34181f4c5e40e9e5139e346121779f4ae3b2. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZHN62568352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38eb502689ddc07452ccc305735239fe56d43dd8df16c3fc721818fc7d2caf6. 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/QZHN62568353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d384a571ed843daf4df610a99ae7f7a964a646c2685015e8fc071abdef6a8bb. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZHN62568354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7be7af2f37e0ca66961d97e48b35661d29a40692252bc6c2df142d67d68801. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHN62568355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0481a1006ba5dc4efd13a116896abda17e8b684c1b7fe241de85c9c45ab1302. 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/QZHN62568356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2e24c752990d76d82e49b60d99a461b9d7dc2c07761cf6d992e52fa24a8f84. 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/QZHN62568357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002aabd4ecfa5d15e76c324e002fd8ebba5322cf87c61974c029712f0744166d. 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/QZHN62568358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718ef4f5d274b3a1fd0963ec4202e0eb9f7aa245a8586b62867d40aa35c12726. 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/QZHN62568359.