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 0xe2e9ca307dc654be6c5d674071962b8c1f0fd1b945ff81b31f48d7509499bf6d. Chain 2 (Bitcoin): anchored in block 954013 (2026-06-16T22:27:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35089158-8415-4fc8-8d90-6f3b87c4639f.json and https://artists.proofprofile.net/proofs/artist/35089158-8415-4fc8-8d90-6f3b87c4639f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
This Is the Way the Ladies Ride, Ride a Cock Horse and More
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 0x480a42243661fbd3f12f3db2a303a3f5bd632bf4adf5fae853b2d3e2f1e2ef04. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DK5C50137902.
Simple Simon, Oh Dear What Can the Matter Be and More
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a87ee5487fc175d692e3b2f8989ba09db082b370a1322ffd4ea478bbbfd502. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DK5C50137903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d30ff683484cdc0638856c7f3de141a8081364eecadba5915b35c6db977e8d3. 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/DK5C50137905.
Yankee Doodle, Here We Go Round the Mulberry Bush and More
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b26b70677a48d833dcdcd207fb41e0af8e8a0885baa609e96bb8dfd7149338a. 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/DK5C50137906.
It's Raining It's Pouring, There Was a Crooked Man and More
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb9b8ab4aa4301a0e8c174194a93313afbf97c72bcaee34c5ee9f6dd56c2458. 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/DK5C50137907.
The House That Jack Built, There Was a Farmer and More
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1574e4af35d93d58b644690282018c6c3a2ca18c436594d6e4c3eda39ecdc2dc. 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/DK5C50137908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd33e5fdd924c525be7924932b6e7d9e150098ecef028a9f9fe47a28e21de99. 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/DK5C50137909.
A Was an Apple Pie, Mary Had a Little Lamb and More
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5472adeb9b80f76a4255682cdd64818dc80b858b03088e6cc860e368f5c77f21. 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/DK5C50137910.