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 0xda76922b32763176105cb4c1af22f6ace8e79d8c0df28027e3984d4cb5414d34. 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/b3ce1917-678e-4c6d-aaf8-91f87f6e24a6.json and https://artists.proofprofile.net/proofs/artist/b3ce1917-678e-4c6d-aaf8-91f87f6e24a6.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 0xbee6cf370929d33052bc24ca4a8f23adb2bbb20137c851c831c4541a42c71376. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/UKNX22222686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd01374d5f5b4e75663c919d2af07d126510cfe11eb0b61c5b2878d30090edf9. 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/QZES62321086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0985688f6c603884724347e373bc5422efa8636c9226830eca1d8f4cd28bb35. 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/QZES62320905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849465bad1aad66ce4773026347ade06c7fca7d0bbf5bad6ccb0292be97aab59. 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/GBLFP2290641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa4157063c1b5fdfaf3731b4f215acf747553a6be830c836cd27251f4fae02d. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZES62321087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc592fb46d4d73fc6b29c76b80b61799026b4f26581d4a2d88d8fe42ca8ca6fdf. 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/GBLFP2236370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0985688f6c603884724347e373bc5422efa8636c9226830eca1d8f4cd28bb35. 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/QZES62320905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894b51f30f1f4a320292024cd3214e048e370c30f64f708984a1396c046c0b32. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/UKXN22222686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8947c264e45e2dfa4da447d78eb830bae16ff319488645a1ad0aacf9eb92011. 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/QZES62320906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa718b3aac7f21df15b2ad2c637de53fa64719883471e0cc600eb19f60b6f2500. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZK6F2374718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607ff0d3dd545df3b487a2b8bab81a2b2a0d3c6d886e02110e95b7ec3174e75a. 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/QZTBA2389214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fb112f856e31274c1c46c4c331fcc92b637462f9f0e69d2a4626a1478309ce. 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/QZK6F2484372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312ea1ed7c0cc681ebd57034bc334c02fd068b4449a5c727ed3cbd76994dbd83. 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/QZK6F2484366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be93ef122285ae7d3460de1bf48fdfb67b4bc45ef8d0c1034abccf6c4354df7. 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/QZK6F2484367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c7a9a711e9d0892b4cb1f81195bc72f6b315f7597e4fc2723aeb9e9bf623b4. 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/QZK6F2484368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ba736b0555bebf06b033a59d6911ee7eb07c0ac2bfcf8d6c478e57ec74c61f. 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/QZK6F2484369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebe86922ada280167202b604f218e71d1865cabf42e733bade13b06f5983b4e. 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/QZK6F2484370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0621e6f259147cf87aaa603b899d00c250526cd017912a84615ef0818c504835. 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/QZK6F2484371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fb112f856e31274c1c46c4c331fcc92b637462f9f0e69d2a4626a1478309ce. 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/QZK6F2484372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2566780e43b363e6434e5a281a3d10dd5d9ded0066819062ce24c40b49e7358d. 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/QZK6F2484373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607ff0d3dd545df3b487a2b8bab81a2b2a0d3c6d886e02110e95b7ec3174e75a. 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/QZTBA2389214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e231068292516eaa2f197442ffb074c77ea3d0b312d5e1bee6d68353b1ab1ac. 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/QZK6F2484374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0621e6f259147cf87aaa603b899d00c250526cd017912a84615ef0818c504835. 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/QZK6F2484371.