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 0x3b3571976a9a13470b4a7c71d6eaeb0691be77ac7efada56d1c1869923491751. Chain 2 (Bitcoin): anchored in block 953782 (2026-06-15T12:13:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4a5ae3c-e0b4-4ffd-a8d7-f5d11d81a3cf.json and https://artists.proofprofile.net/proofs/artist/d4a5ae3c-e0b4-4ffd-a8d7-f5d11d81a3cf.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 0xd476eac35bc36944719d16b3e183ca1cb3aa8793ad31bdc235feb5033ec7047d. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TCAGD2229634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5f59226ae7e25a782b8e2afc030a7d8cc908f0eab631159644f33a017e421a. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/TCAGD2229658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798f8a42e66e87e7133ded4bb1ba00236f554059ac157983481b6a47f4b80462. 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/TCAGD2229659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe6ac3eb194614cd83bdf800c4cf778da4c06bf4d2407aaabc5678ea7083730. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/TCAGD2229665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9967645a5d1dc490a3b73fd27d7318486d64432e37fa6a618cc57a04a2ab2569. 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/TCAGD2229695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c080e12d022f52a308c02716a0b256bef1c7074e976678555edc1905eda9cdc. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAHZ2454497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88d2e1e262b365a43e4a261cdb2a9472f6eeb5ee2f6718c84134a4ae619ca48. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCAHZ2454510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970e2d738e1395ef7f71fda3cfeb8614ed6c4add58eec77ef99d121aacf68778. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCAHZ2454517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51aa5932401a0a3da473cc5fd6d8068e130e1593701e00b527e9cdae3d54b4e2. 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/TCAHZ2454537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a2f751fb625c38bde72f02d56b2185097d8fe606249cf83751c36b0cbd6cd6. 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/TCAHZ2454544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b60a3a55126d761b24fcc9b73a1651291f575bd0fed88c779b6bc05ed5ebe8. 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/TCAHZ2454552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506f3c2428184287d83af51b97cddd4e7ac49362cacb1125656c2fec76b632a9. 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/TCAIO2463365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798f8a42e66e87e7133ded4bb1ba00236f554059ac157983481b6a47f4b80462. 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/TCAGD2229659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9967645a5d1dc490a3b73fd27d7318486d64432e37fa6a618cc57a04a2ab2569. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/TCAGD2229695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c080e12d022f52a308c02716a0b256bef1c7074e976678555edc1905eda9cdc. 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/TCAHZ2454497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970e2d738e1395ef7f71fda3cfeb8614ed6c4add58eec77ef99d121aacf68778. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/TCAHZ2454517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51aa5932401a0a3da473cc5fd6d8068e130e1593701e00b527e9cdae3d54b4e2. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/TCAHZ2454537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a2f751fb625c38bde72f02d56b2185097d8fe606249cf83751c36b0cbd6cd6. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/TCAHZ2454544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b60a3a55126d761b24fcc9b73a1651291f575bd0fed88c779b6bc05ed5ebe8. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/TCAHZ2454552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506f3c2428184287d83af51b97cddd4e7ac49362cacb1125656c2fec76b632a9. 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/TCAIO2463365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5486d4d0b34f9e092d1459bc295176d63f0cbd9c2ec64330101ecb5466ac4b07. 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/QM7282509422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x205d9f9a393480b1d3a0b1d1c93fb0c26c3bdcdd5bac51ac9896fc6a321498a5. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QMFMF2526048.