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 0xe4ba65783877c87c761cd24620a933abc9f06ef354500012942a69aaea47fb48. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fdc30913-5af7-4df0-a50c-aa80936df126.json and https://artists.proofprofile.net/proofs/artist/fdc30913-5af7-4df0-a50c-aa80936df126.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Recital at Saint Mark's Cathedral (Live)
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 0xe450731b1bbe21b7ece35e50e0e83ba930d717205a2ffc5702f397d607b44397. 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/USG3E0524501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3b63b39730d77818301f00e5ce2efdb09fe1e3fe9d81ccde1bc9e86f82c4ef6. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/USG3E0524502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed75a2d3b4ec34ccc7ae33e70abc3f5c002ccad585ff01bb5bce0df66ab4d891. 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/USG3E0524503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81772aeb5fe6d09bce6c305a2c7f32181fcf0cd9a93154db502a419d115955f. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USG3E0524504.
This Little Light of Mine (arr. M. Hogan)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3de47d75f72aab828ce286f6ea387445bdf31edb46e935277b20350e3b14f0e. 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/USG3E0524505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58bfd055d19f026522cf83fd6f716c44b0b6f03b5f6fdfafd138eabd3dff5408. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/USG3E0524508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacbf54888d60f6d58561eeef61b1e7e8bdfe6037e48aa9f125ac1b85f4af6ffc. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/USG3E0524511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2150979e03d7af0f269ff85e069656617ef2153b04e7b67cb58af9e75a5e0353. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USG3E0524512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99e502915213a6238e1a44889552868313d2188cdc6a8441d05ba65fcf761fe. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USG3E0524515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a55f8fe6dd0a85fbe58444ae654703e9dd4b3d5f0f1d1ace805fcec78710f46. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USKC60713999.