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 0x661506771c27186c28e26c843ee9d14dd62214029f5194ed203ee1ae79bfed99. Chain 2 (Bitcoin): anchored in block 954017 (2026-06-16T23:38:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/36aa1947-f7fe-482a-ab4b-2d8e2ff39db1.json and https://artists.proofprofile.net/proofs/artist/36aa1947-f7fe-482a-ab4b-2d8e2ff39db1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
A Night At The Opera: Overtures Transcribed for Two Guitars in the 19th Century
Laments & Dances: Music from the Folk Traditions
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 0xbef38d5f659895063485b5075ead4115bcd7bd554b974e2e67c133f2f704c3d4. 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/USA560643253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2a02eb4eed616fb17c5580b3be9f013a19c2c12e8feb557fced0f213c1dff6. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/USA560643241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e75145719a04bd911cacb9213fc169036f60726a97729c6bf312fb254a289e. 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/USA560643239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208758a5d9b295673fbb76b68bd5f97b15a03453491f01974c23f6afccf84c61. 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/USA560643260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a27f06c1b39df92a92339d0d7c1bbf475a29e670462ebe4684304bda7bdcf5b. 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/USA560643244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7523675b43701e99cb3ab3d0357f5c5e5e7f576bcb7420854b3cafe326b3c04. 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/USA560643250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b901484d3405fc14d55d78ac857e769f8e3967312d122f69331921aaf0cadac. 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/USA560643249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecccc62da69ddd8da5b0ab7ef82f01b85bcf461614cc624011e20328fc340d5e. 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/USA560643240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e30d835c45d5e513609bda03b333b24b1aa40b3567bdca4aee4d74f0468815. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USA560643261.
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 0xec2981fe55ff302816d4a8dd576f70256e918040fc0aa8ccec6353395cf7ab2f. 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/USA560643237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e2c202aa150959e6ad9c48ab7839fb7030eb6e9d9d26c5d9777d31e1650854. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USA560643245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982ee26cbc77f4204e8cfe86bf19e2fe8d6da534bc4ec03fd09f39e2529a48fe. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/USA560643252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca662221c142740750c5d5c0ae12672141bf4f14632c8fdac95c395af074e7f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USA560643243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d15f7a9c8a7b71608454247081d6759e4cd659e87712ad8231b483c61b4e09. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USA560643263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51717ab0ce0f7448b4c72d7aa799ab0510bdc239558fad05b8d3fa1ef9a5300. 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/USA560643264.