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 0x361a68413bf78c5aff228d09437772915006fb0136a928ba44405d8afbb8b965. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c16d324-8886-4287-b34f-0923af24158e.json and https://artists.proofprofile.net/proofs/artist/7c16d324-8886-4287-b34f-0923af24158e.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 0xa4777d48572bc5dbd46689863d15070f7196419a27dc29319732f9767027fe4d. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/JPA652306742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb569dfa6d8373f4298649d61f9c232a584d34d024e536002ce02c9461fc511e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T21:42:36Z), 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/JP92U2400585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac726f5c199033670ed6aad59c59305654983adc5726ac637c2aeb14009468f7. 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/JP92Q2401486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0090c01530ffbb74fc88c780c8941e25c66c047d264724db9788cac85608fd04. 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/JP92U2400777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0090c01530ffbb74fc88c780c8941e25c66c047d264724db9788cac85608fd04. 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/JP92U2400777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7a4000d30435f286af139ae65d78a23205a3e8f5b7f1cca35b1c0f76026414. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/JP92Q2501711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6fd501aa4879a1154a219756f36f68cb41a7a2b65422d809aaa31f890113d9. 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/JP92Q2501710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85eaf9e1dd075fa81db85344614b2c87672be0b4efa5f6dc2dcc33f38cda3dba. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:54:25Z), 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/JP92U2500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98893af6808eb77a3723738483fd9872dd213ab6d1290a9a4a4af1288c2a1411. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/JP92U2500103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98893af6808eb77a3723738483fd9872dd213ab6d1290a9a4a4af1288c2a1411. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/JP92U2500103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf87060e3af92ab7c11ddf5d062d51ccfd0543cf02a6ee5f806748bcfd6eff4f. 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/JP92U2500466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc57d3af4573daea4aa3737411732ed5f4ed390b77b9e65af5fd989053fc56a. 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/JP92U2500465.