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 0x9b2a5e0cb7956c6ed802fb5762069794fdebc51a2efbd3e64ae55dec0f792a69. 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/e6751cb6-c71c-4970-9fe9-a0495cfb765d.json and https://artists.proofprofile.net/proofs/artist/e6751cb6-c71c-4970-9fe9-a0495cfb765d.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 0x70d5be2ed370f3037d6cdfae016a6c079929a13203d3e9a7eacb79b2a84e94ef. 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/USLZJ1143474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ec7e790c3ee3850d8d01afb47c816151f7bb2f288464f51b28f18c2c9a33ef. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/NLCK41015779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0853d7e6a043d69217da158dcfe80bfd3c8e83bc20569b413b333c178c114c. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/DEAR41323072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153efe75d019a799d87c1812b4e66afeb8a1930cfc55bd3093c5cde940f91585. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/DEAR41323073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0f291e394f38bae681ead6d8482721f9e73aeac51f9ef26483f75d9c4183c7. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/DEAR41323074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6468af9dbd1a01cb14b01ccaa92ff70fad62fb54fe2d715e0c2c610d318bbdb4. 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/NLCK41034006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4cf7a7aa4bcd4d1b59ccac9e7c3132dddc848a887eea979adb724079294856. 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/NLCK41040103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e9a81f29266d780a04b1081592420dd4c8b831814278d0185a573c49c95f89. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GBCEQ1700040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74a4d06f828c67a4a24fc85eca4482592e8d0667fef95b942f4d493bd87a2c7. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBCEQ1700041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31ff4842f2a98bcd48d76d8d4a8023306a09c9ac26e311a380fe188cf53ab9a. 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/GBKQU1760177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c8d5810aff5951c0d06542ff34fa4b3214c4144570f179490c815b3c95d0f1. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/GBCEQ1800124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x201d58f3a610e390f09374c294f635c2078690f7cf6f480ab42f81f8b22b58e6. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/NLCK41057029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ee2a3b2b01801817af0d52794c95dedffdccd18b505697eedcfe11be7aba16. 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/GBCEQ1400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb9fd71cae5c9b9eabb9b91d4fe59291d389061242ab16eb6be80118b46e58b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLCK41040980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7e307333dd41ac34113a800e67b89fc4901895891d1f3a5e7c9579032c5bc6. 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/NLCK41028782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875e16cce3d82d73270d951af04235778351fd66f6c3a880bb02da90497c117a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLCK41028783.