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 0x1c16b7b2e835337656cbae91890dc9e19fa4073b9b6397a3edc6597faaad5476. 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/7db36666-d25c-4b8d-994a-c4f559c5903c.json and https://artists.proofprofile.net/proofs/artist/7db36666-d25c-4b8d-994a-c4f559c5903c.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 0x1be96a5250be182fe35af6bf1e1b497fb188370fbebf575d44ae8f665036201a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US83Z2478884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f944b78e7207f1ea4f061202af7c78393056f5cf79aec3498c797d823c62d41. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/IT3PU2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa396a7f9714352abb36029e3dcfa032ae0e708a9c740df295588b694669171e7. 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/IT3PU2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3076b38fceb3ef84bb2f60e97aafe23c5d105c080abb6c404decda093922cff0. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/IT3PU2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9d655ccf162a06b16b9f669033d4a162d84a958e585689100744ad3ba256cd. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/IT3PU2100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a228e047fb08a92741cd40012df24402dc2be42b7d0d57b9845846371a9ea4. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/IT3PU2100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19cfd150a57d5c39692581c99fa7e0e739d35d7b8ef85101e1c214f09b7dd8f1. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR7JN2100170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a247d91b67af027e37fda52d5b4a56fad68fa96c257f9a7579b7b8b13f8ba3. 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/FR7JN2100180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6daaed8b57ce6f4328f25a3a665ecc31431de0dc393bcd42e510e1f89c920413. 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/FR7JN2100190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9845a8f9f7f9a90618f90921b1ccfd1a2ea7ec0a9e532c505e8ded68d404655b. 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/FR7JN2100200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37b60da7b20f5351a9d8b9f05ed3c626fca61f99c9b7699d8332074ecdc96aa. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/FR7JN2000480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0314d9b08ab2521a0a010d506e06943bd7c1e132c8a37b045b7762c76d798059. 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/USA2P2043969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb37b60da7b20f5351a9d8b9f05ed3c626fca61f99c9b7699d8332074ecdc96aa. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FR7JN2000480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7445f3a70d2daaccf5eb9ce04201f15fefa8243f39d0bfecfc8f17d499cb6e6e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FR7JN1800710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0159866383fb6a18d4f793d81546f0dc8d64fb694ee505887ba4957bcca66ad4. 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/FR7JN1800440.