David Coffin is an American traditional folk musician specializing in early music and maritime music, based in Gloucester, Massachusetts, United States. He is the song leader for the Revels music prog
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 0xe9e6fe910670daaa19c36033d4da70f9b2842c2b13a8247e24ed6a221021b9aa. 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/cb55e101-fce4-4aef-9c01-55f4ffbf8b0a.json and https://artists.proofprofile.net/proofs/artist/cb55e101-fce4-4aef-9c01-55f4ffbf8b0a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
David Coffin and the Nantucket Sleighride
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 0x2f48281af8ccbaffbf218ea18dd7476b05d6363a6e09673c3f6835f5e2879523. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USGCV0826309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4973902d2422b5fd54d4fc927d5104ccbea38fbfa57af91db9c29b5c1f0a7dd0. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/USGCV0826317.
David Coffin: Live from the Revels Stage
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc5f1d4a64ae9335cf4ede625f6508119d1c09e18f555b6bf126c49a7a32428. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USGCV0826328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4367c630d8ef61cc7a9fd79b50dd1155134e57dad5b65ab58580ba2d888c7e8d. 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/USGCV0826336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3a32f1625489165e8068096606c93caf58ce7b48ce579d22f39efbabcbcb7d. 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/TCAFU2191251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dadc4c4bdd66ffeb289730bcbc19968c3e9996bb9326142bcec15ad9c6e76c3. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAFU2191287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dae82a9cefbc86d0d060e87c10d7b27ebe279ecda51453714b4e9be4375d603. 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/TCAFU2191258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f8e9b0d354f3239a0fafd88d90f3e4d495d8f4cdebd5afb0da9c1626c4453f. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAFU2191267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc62fc48943c2d816d751faf3fad37d51ed04aa68b920bd26a79e71543571b7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAFU2191277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1a5d9b30cf00eb2999000b412ed951674cf4ff9749320e3a09c156e3be687a. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/TCAFU2191279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8bb6855e086cf96800847168a54817c86fb4328dbc2c3046f845dd9736f11f7. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAFU2191301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec8cd353caf9e04b6b646bda2c2d0e2690c3421106a7b1ad3e3da201967083e. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/TCAFX2180424.
Welcome Yule: An English Christmas Revels
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ef5130e80c09e4b7997e37d0f92b3ed7f19ab219874bd89f307a99c9d51bef7. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USREV1001003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a38a16e938bf8ab3da9ff26368f212939b5ed53e8804c9ebe85219a8028986. 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/USREV1001006.