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 0x6c591fbe396afcfab7cfc8c5b06704da1f1a87bba3ef8454f6e939582d997451. 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/59cc09e6-da70-49d5-9ed2-4466308e7dbf.json and https://artists.proofprofile.net/proofs/artist/59cc09e6-da70-49d5-9ed2-4466308e7dbf.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 0x1f6c36b249320ae5c9f70879f052be21443d8c2b0bdfc53ecd23aee95ed18d20. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DELJ81766720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf0d9fa228068a4f63efad5c72cf93cd263a11e02d103288a06001e8a825868. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/DELJ81893219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674c9b6e84697185762da95c0f52e4d40633e0352dc85e29d6c91fecd037143d. 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/DELJ81896588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9f11ce441ad0151580bbd5cb11f0d4cc1645209252790784c6c32fd3f0ebd1. 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/DELJ81800703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cfc2e10ecb9d98ec3774a81254178e26cc1fccdcb7783270e17d7c4f4aa23b8. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/DELJ81818229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0cd093e209107cb630df9de27a3b725a563f809956772baaee3d6019d00d1a. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/DELJ81951812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714dbeb8d2833eae45aaa02f8bf16346f0e05ac54930a48abc8d973d90fbb4fd. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/DEKF22200928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8890265293bfb56a7fbe93c42de89913d4fd65343511e0baac3dbad555cb04. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DEKF22200939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06586bc90e12d4b1c2496dc55988de8ff4594613249462a44085f89238dfb7a2. 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/DEKF22300096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d659fb31a7b223785d63e98565018afa488ff7d56292fc567251fa1f949ea6. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/DE1I32300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1eede26cd2653666cea96def1d614e9e1445e00b8f3fc3a3f2adbb2f6baf7c8. 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/DE1I32300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d659fb31a7b223785d63e98565018afa488ff7d56292fc567251fa1f949ea6. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/DE1I32300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab76b03457148c5c4eb79b43dd2378df4dbb3321bc8a1d4f6c4b3a62a200dd85. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/DE1I32400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab76b03457148c5c4eb79b43dd2378df4dbb3321bc8a1d4f6c4b3a62a200dd85. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/DE1I32400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1dc8132db03020aa0dfe5d855d2f0013a98104768ee090aa2116c4ff25d64b. 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/DE1I32400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07183e665918d94311590fba1e5bf35159bfe8611cdc2b9d48da2d020a7bc6d. 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/DE1I32400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab76b03457148c5c4eb79b43dd2378df4dbb3321bc8a1d4f6c4b3a62a200dd85. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/DE1I32400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c4797aa69e7cad75a11d7a219b24bea5e2f2bc4ae2993c17882541c69e8ffd. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/DE1I32400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ec57dab134becf20b19798a9edbd3f11443c44109757d346b0cbc7dcaf73e9. 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/DE1I32400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0c6d751c47e34089093462f435bc397b3ad76f59a5933483c39ae6a31243e5. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/DE1I32400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ec57dab134becf20b19798a9edbd3f11443c44109757d346b0cbc7dcaf73e9. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/DE1I32400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6aefc12b6d7819bba8ca46de9c1ff3c965398e94139345fdb26588f3ac222df. 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/DE1I32400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c39dd75b4e59c56a4f06c985c241308707d2b9b28cba923de7d7bbdb67f18ef. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CH7812214235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec05a7ccd23501c019cde3443bbb21e4e5ecc97ac49ce94695826e89f487eb9. 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/DECE72301546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0883709a536071de211f2e86be9435bdba36c814bc4446af7962c75d8a9875e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRZ082200248.