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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2988cc65efde0e0a7038d26652fcec269797cf068bfa83d341acd692bbda45. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0a92c31-c362-47fa-903c-493b1f6e450f.json and https://artists.proofprofile.net/proofs/artist/a0a92c31-c362-47fa-903c-493b1f6e450f.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b38c92fa608e16fe6a4e243c9431e2c5b9d47190fc5d69931677da842010aa4. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-17T03:30:47Z), 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/USHM90644186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825324b1133c1eaa1bfb5004732c502ff2cbbc8c6c3ce2be9ddf5724a160c5ce. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T23:10:30Z), 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/USHM90644187.
Cathy Fink & Marcy Marxer Present: A Parents' Home Companion
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3811f3e88fe2cc23cd4f1fe30ab76d0289a57232f6c3b7ea76747266d6cf88. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/USRO20759913.
Where Have All The Flowers Gone: The Songs Of Pete Seeger
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7007b1cf1172a408324b39930eeff0a23855a6ac391c0b18114594e74fd09c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USASR0502433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffb379bce66da5be84973ca2267b6028d613c050c99189f450f4f05f8c03f75. 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/USSF10405915.