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 0xda392f73174a87e7b96057525d3e5c5cf74d835714c3a59d70c1243901568a58. 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/1c80920a-9a4d-49b9-8779-5ab3146eaa92.json and https://artists.proofprofile.net/proofs/artist/1c80920a-9a4d-49b9-8779-5ab3146eaa92.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 0xc027f271ec46858e2fb5a6526d5c4383eeffb2e0fc1c4e9141c1f3b37ab89bfc. 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/TCAEP2053218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b2cd61ceac28a3823f14f30a968d4b896e397a25c05adefbdd1de697a396bb. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/TCAEP2053206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26955d7b314ab5140efd74df6afbada0ecc770f21d88a1c6788b9911b87e8636. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/TCAEP2098659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bf8e239aff7420dee63fc6cd874fb676e5af45b6f6314ee695e015e8dfe8d0. 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/TCAER2092464.
I'll Be There for You (The Theme from Friends)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a13dc1dc6eaf21f88d977fd6687fa8d7fb4100a4d1e3b687de49a1686f11d23. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAES2078645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6bd09ee8d27c0bc91853be9d5b098a4d3194d2b0c8a1667a1c6ddf5aebd4ec. 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/TCAET2020229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce54cc57dc7c9a550c18a1427b009c163e0561d279a01d4dc4c8bd890941edc. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAEW2048151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fefa7e781a8698e65334fd944c9d6d5323447f7d884bb3fcaed1ab0ff9e7e7. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCAEW2079943.
(God Must Have Spent) a Little More Time on You
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11eb2b6356000131fffe2ea26d3ff416f829d328fb754c00db036dc94cfae8c. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/TCAEX2052240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc9d45cdb66f6c9824fb6f9129843d284c5f67d7a18f83ab1729b20f839bf99. 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/TCAEZ2073871.
Sweet Child O' Mine / Don't You Worry Child
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1232618edb8bd05c865fdf44cdf3943069930d0b81a626d76c0496aa57ec11ed. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/TCAFJ2107338.