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 0xd19d31d095dfcc95faa95577581d4769bc25f8d0503af1b284c9ca84eb28e2e1. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ac873d97-e6bf-44f6-9375-2d190bd52c60.json and https://artists.proofprofile.net/proofs/artist/ac873d97-e6bf-44f6-9375-2d190bd52c60.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Smyth: Mass in D Major, Aria from "The Boatswain's Mate" & The March of the Women
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 0x09c6423fcf46bc4924ff148c09574e30fbe15a045d4dc65d5aecb231601b2ea0. 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/GBAYC9003653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9970bf91c1300feb5494556ed5f4813dad90656262c4f93d6fa8a288cde4827. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBAYC9003657.
The Sons Of Knute Christmas Dance And Dinner
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29028037c8831794c61ccfa297929646fe16c3235128e752d7c6f826c6c7e2bd. 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/USAR29401101.
The Plymouth Music Series' Ensemble Singers & Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5f9561aa6cac268d674b27a04182f762cd2db90308c1e96a91245f0ec2f030. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USAR29401108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7eb0b87c3d7800b648b7a01bc49dcb16a24d9f2528a91535a7b273638828d3. 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/USAR29401109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ab3f2fdbed0f9a243fc22bcd0845229bca1d3123e2d0f461fdfaf9c9a8d9da. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USAR29401117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ebe676bd477a8f125a76cf023bacc538f0caa9011ac8b621b7522fa7c6ef3c0. 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/USAR29401123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890c39a3bfdf1f7de445026d465c0a1b1e3ceffbf27f88ee541f88050d0e701c. 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/USAR29401124.