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 0x0f19ef86905abaa28eca96dfbaa21035c651966affd8b93e43a6f576d658f4c9. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b7c166a-ef99-4567-bbc2-47cfc3cc9fef.json and https://artists.proofprofile.net/proofs/artist/5b7c166a-ef99-4567-bbc2-47cfc3cc9fef.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Good Old Songs:from Ragtime to Wartime, Vol. 1
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The Good Old Songs: From Ragtime to Wartime, Vol. 3
Good Old Songs: From Ragime to Wartime, Vol. 4
Good Old Songs: From Ragime to Wartime, Vol. 5
Good Old Songs: From Ragime to Wartime, Vol. 6
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 0x31575fc3cab79433272866f46982f9b3a655a407c5716f5cc9463f633d97f643. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USCGJ1273409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6132fa3b5733e0dadc1716673e33f3ea99efe720e0c05b95c0fdfdea9797cf95. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USCGJ1273413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96deece52bd4742217ccafc815b8316af8bfc7007322ecf6591012f88d94432. 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/USCGJ1273419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ee32ac33f1e86bb7bdd7578746709f5cffd8f2c3a2a89a479b241296955a46. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USCGJ1273422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39aa6562dafd4b9f72de2ca699485cf2e01dc81190a022fe9b391d71699dddef. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USCGJ1265838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff8e92a83108d0f66d9861e7fa605acb2135eee16d83b62be4be7e095506927. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USCGJ1265845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa549eac7eabe7e61a20bc0e6d6c959e52ab94526eb0953afc2bff2467a5d203a. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/USCGJ1265849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d1d1ca5f9e2ba68b3ae8091813a9680742f6eb2b4170f18e20c4d5ed3aff27. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USCGJ1265850.