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 0x11f71cfac482eec7c6038bd766045c1af1c417077e40c01d898891e56851eca8. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/78e21a9b-5dd1-4bca-bbc4-168071a0e228.json and https://artists.proofprofile.net/proofs/artist/78e21a9b-5dd1-4bca-bbc4-168071a0e228.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 0x7b6ce5d36b7fe2124f1e6afa3154c2972fa6af6a77a246ab775cda4a80fa094b. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T23:43:43Z), 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/QMDA72347086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7c2eadd5c900daec0fff97c362308cd73b72c34a4826f5be697485d30cf9ca. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/UK6822411811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696ac11fe80aa5d16973e8ef77587d71efc54caad4fd46e9ec230296ed92531c. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/UK6822411812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x606f1324a391a38e8df4d12a1aa4f96d88676bf8180f3d779348699889a036d5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/UK6822411813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22a8ce50e92c4c84152688d07bb8956d49fddba520056db3e4d96b05c2b268e. 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/UK6822411815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57aa99e12307ac02e883e17485b12789899dc384c2b795125c843fc698d8bd81. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UK6822411816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a04b0b19fed3cd8a35e063fa2c6dca4aea06d64624f3bd2381a572f42bb1332. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:19:24Z), 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/UK6822411818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98742963203d21f9c0ed552b06ebb0c46dae3bbfc68c9d6d0ffe9573a144377. 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/UK6822411819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x260c8851bfd63b20698e0d80f600ead70437d0bd03dd97f3666eaeecdb7dc58d. 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/UK6822411821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506305d24faef860abbaf22df9cecb7ee63da1e67651a764396e68d678b97716. 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/UK6822415324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1d8bc41a3fa00784fbb4a5a85a661d37085a5548d2b43702d2d192b57f0d7b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UK6822415325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf856ad8958f1588688c8b65a67d888628ba42f53fe870c4a797eca20de16f5b. 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/UK6822415326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56de79855d5650f2e768fb2eaea1bf6c92b3e2ba363267b1d807536ae9d2b91d. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:39:13Z), 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/UK6822415336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab55084a6d441de3144887308274c3d3f69bc891aab3b993d0389452143d0bc. 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/UK6822415327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4b3d326fb9d5d11a5315dccb320b115a90072aa19de74ce4db693c1f78deea. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T16:04:54Z), 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/UK6822415337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef29a1c0c57dd53fc94c301d1313c1a3f7ea6a0a7b820cf9ef41e54df0634cf. 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/UK6822415328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ea769484b0e8b33fcf6618529545f516314e999fa04b8adaf349ae3cae0f13. 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/UK6822415329.