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 0x3e11c272f8208df5196b231598f648caacc68d5e7f439b63a0cf863cc5285762. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5a5aae79-f227-4cc7-a184-5e21c83d38a2.json and https://artists.proofprofile.net/proofs/artist/5a5aae79-f227-4cc7-a184-5e21c83d38a2.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 0x06cce2537d066ddd9801ab452e62a4537288a00ada478546e62a53fc35dd5ca1. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USN1R2418002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745b661ea67cf9708676ec0ccf395e55d3a4165da297e6b79ebee598ba5d5df4. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USN1R2418003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8aca0b153e79f779d318bef588f3663207b4b2eec7e0c2df4decf534f2384b7. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USN1R2418004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf269f10f4d5e60a1cc21a4ad7090db98febf8a3724d6406b7383717f429574ae. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USN1R2418005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31ef060e775f955b44bf2644bf8b1a9f862d97d6aeee8d8945fcb37b82b1bd1. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USN1R2418006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90350ef4e1bf4331e13622ca4866bba89c7d148e83f2fc2ae18c9703edbdd653. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USN1R2418007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb74288c7b633291b241545ed914127bf8fe86f27c3bbb035f1bd9b6b64e5bd8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USN1R2418008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13f4d7489a359bda7fbb162d21e26b406cf5b3af494a0a4aac574f1255d4ed0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USN1R2418009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88522aeb82f33c52c211c59430e98073f28a563d7334ab21cead7387e5fd9261. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USN1R2418010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00782d176d0d0f158c50c40fa01a8d09d0745ae28b4155af88b43cb0f2f8aa1a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USN1R2418011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b93ca64770ebf5696ae8a622bbc4bd67d417165d8dc4fee2cf82aaa5bc5fd6a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USN1R2418012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bcbc07eca0e2f418647a23fc99c419ea3a65bf9903c872f026eab27e58862be. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USN1R2418013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc724bb5d278f377964a1d8d3fbc6719d3dc10dd50d15132c31302cd332537f9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USN1R2418014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282a2371a1502d8f68407faf7802a0ab9c9a9892c3327ded83043b04dad0cadc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USN1R2418015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd749b8d279f8dfd395e78d0b2aabbd29b76003f5bb59aaff50e504654a9330. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USN1R2418016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b891a137e5185fe8b02304cc2f3394b1f84ccd54881c53e14a4ec9acdf981fc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USN1R2418017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292ce60cb1629a4afc72e0a7471e6d81bc1078f48a7d4b86253d4299363cb0ab. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USN1R2418018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c1f7cd320745c1847f609cfdf7a6bfe740432fa87103370dee344cea392e1e. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/USN1R2418019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048f6e5953192c62668cdff8496abb9a39a2d99f3c4ca9a741afd408d2adf96b. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USN1R2418020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd297b1a6f5b9e8be1333d43b3dcc61635271fd969619473dfbdfad08709860. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USN1R2418021.