Peter, Paul and Mary was an American folk group formed in New York City in 1961 during the American folk music revival. The trio consisted of Peter Yarrow (guitar, tenor vocals), Paul Stookey (guitar,
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 0x692b9e0c95ffc95600a05d2ae4b2ea4263f38fc14905e2dc7b3bdfc4fe8e6d88. 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/5ca0a1f1-e972-44d5-99bd-d3fd0291c14c.json and https://artists.proofprofile.net/proofs/artist/5ca0a1f1-e972-44d5-99bd-d3fd0291c14c.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 0x0acff27e728983bdec6cd8c0a1c228205fa0f387a4ebe56e5ffa5aa8875fb37d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USWB10302468.
Where Have All the Flowers Gone - 2004 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6325f7e4ce676721ae86ce49077eadfbeea2169fe582fb4e1460be8c62fae3f8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USWB10302472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805f9bf0fdd37c3e34082720531b7978dd37e5283f4da67dedc964050139b3e8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USWB10302473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a06a24d190129968605a5cfb993b021597476ba95ac677f6c4f62d42a205077. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USWB16900037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a35b82f472d6abaa84ea72ef9c96fea9cc0c23136d3fb89cb835fe5a7e1dd2e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USWB19901501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0126a31b564fef58c4adeb642eddbe34100f1bce5771708a7316e72c7e2cd90e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USWB10302509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a35b82f472d6abaa84ea72ef9c96fea9cc0c23136d3fb89cb835fe5a7e1dd2e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USWB19901501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a06a24d190129968605a5cfb993b021597476ba95ac677f6c4f62d42a205077. 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/USWB16900037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0126a31b564fef58c4adeb642eddbe34100f1bce5771708a7316e72c7e2cd90e. 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/USWB10302509.