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 0x0ec161a94e912ef653f52000ee26f0f52a559c9cfd72b6ae4924b433ac3581d8. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/96a7bf71-09bc-4829-be0f-5baa1939286a.json and https://artists.proofprofile.net/proofs/artist/96a7bf71-09bc-4829-be0f-5baa1939286a.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 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 0x8b9d2d168540b6866e0e6b5c7404c84ec65422dda7b569372c314e03113f07fc. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZRP52234551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0444c9ab1df248862a45db4018dd2dd4fb2e9210894829a0196dc2999d89ad4f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZTB92272182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d649b3b0bcfd2d0773ecf282b67600eaacc03b5bae653770c28dbb88a50750. 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/QZTB92272183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e0501eceabd9a1e2eae9f71dd7707d6fd3c999fc28bddef79d6ffc7f23688c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTB92272184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109a97fd46e8a6768afc7284506f628d8c45ba4f175e85136e7b98a9b475b1a1. 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/QZTB92272185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2396f2b1839877ea8550b52c7cba68ba6d1b05fe2ec8630d6be429c35e2cb0ea. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZTB92272186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb378ae0093db3578ba5c02e9dbc80a135c7975f140664af0375df7a393c4f1. 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/QZTB92272187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90965b1d4de5d526b1f0d834078abab0405893ff8eac46d99a82b45b4e5f904a. 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/QZTB92272188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4af865e459d239afd355740ab86a8b6dbfe2037890b8488e2907ad89e40173. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZTB92272189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946a6dba9eaff048a32736afeb957e29165c18efa558d5130f7acfcd6c89dce1. 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/QZDA82384370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48147afad1553a16ce85c0630f9f9a9d191e22682a644d6a18b74b472fa93b9. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZTXT2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26d710fcd2085238dec1ec4f528299073d16b0561ebba1e307da9043c5664a0. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZTXT2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946a6dba9eaff048a32736afeb957e29165c18efa558d5130f7acfcd6c89dce1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZDA82384370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46295c504a40997675768e7e482245bce0e71d4e6d4284604a1dad9f5df2da69. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZTXT2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431fe15da7bdf0f6ddfeaf80bcb5c616348da90382cc811c45ed114a43427d9e. 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/QZTXT2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5938ca0cd7802d48cf265895f0253e2ed98d81c5414c177488a7fdea046d80. 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/QZTXT2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da923029618472c224752d0632ba78854b8d014c4a53d28724128ce2d477376. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZTXT2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d2ffccb88780265403b6107af821247dff90d578e0561e7fd9cd872b837dd33. 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/QZTXT2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdb29f1284f43ff80a4e816dd393de12d964ae6e8ba8e10fcf2efdbc99f366a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNWY2395922.