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 0x8811cb26577ba5469caf520c1f93e5253eb9346f5d40088db84cca3f9414d2b1. 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/55178245-e7e7-487b-bb39-964e1130605d.json and https://artists.proofprofile.net/proofs/artist/55178245-e7e7-487b-bb39-964e1130605d.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 0x1e070102885c31e2a6c274387a06a0704304297c0b51dc470cba8362d034cf57. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZDA51859985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5d1febc7586912cd92461849a435723209906baa2a4b9c34577ce90834759e. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZDA51859986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7c18db2b9651a4ac94266a935f7e0a6c485681cde2c5cded24d130cfa859c3. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZDA51859987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a6a2b105375d26431a5bd9614432d5cfe9322e68ee361c26b3d7d7773f31bf. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZDA51859991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7c874bcca0225cf768f5a10c74397584ba0498ba720ad7b0fed43078e999f8. 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/QZDA51859014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf38114a14bdc94330b77791a3fdc5a5827eb7bb343f051781e59386e0bed3e. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZDA51859015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6122c6d1759bea9425b5af74ba10ec7e05d7de660498d0b27c0349513dddb9f6. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZDA51859017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fdb4fd56f4335ebaf65604b2c9917bfa4cea58fa83f95f09b1062264ad7d1d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZDA51859018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bc8473540b07af99cbbdb9673b7e3da4e4a602037bf5e62ab601fe0c72dafe. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZHN61902793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea17603a9d6b9d51d0db3ef3470d8314e8e0d6c6593f54891760006bf773dd2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA52079578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afc5beaa9730eb6405e9fb7eab0952e549ecef4c0bcc3dcf7aa52e3edcc4eff. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZK6Q2039022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9337a6874319d7058b6b9ef02cf08e69b2a38b26547e8b1c3a6e2be9ee8a1cc4. 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/QZK6F2021878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5663e07c55ab5ca6e226ea706c7eca066c23aa0dd049825ecb7491fd182ecd92. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZK6F2021879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdbfc9b351211c00affafcef752334079bef56751efffd0214e4e3e9dd36fed. 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/QZNWR2211905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798ce251b60484f77727dcebda17db7970d5d9c1c47017f326c381dab18e3b95. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZNWZ2268866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2f1d6edf9e9979b2d035ecde4664bf73bf34ed76cf2299afbbc1a5acd8414e. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZNWZ2268869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5771bd60b1e5690f2a1b8421f26ef85f9ba8388e8cacd10fc7ef808e839bcf9. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZNWZ2268870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe443ab6ff24f92bfa5ccb68a7aa2c1c27774ecf32972e97e848d957d33b83a1. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QM7282430659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ef40d3d51627f9441e82cfdf6d5ae44843f2e781f2e0ab7ad6188431291cbe. 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/USHM91976335.