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 0x86b6b1b657eb630f0daf96460ae092aed536b7e1b951e8648723437bfa68558d. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ecc96677-da3e-436a-abd2-c0ffb0c93bba.json and https://artists.proofprofile.net/proofs/artist/ecc96677-da3e-436a-abd2-c0ffb0c93bba.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 0xbb3722656682c07e38660674988894d6d25cf7cba31e3b04b3a0cc4eafad84c4. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZNWW2363400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85ce2dad7f83f44616de2d530e48dd2abc01395817c743db596accb04714dd0. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZNWW2363401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d59228d17637632020d7e55138a887662fdbc486a4a947ccd8eac319b1941a1. 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/QZNWW2363404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa828e7e34966a1fb28b31c21e6ff4b579aa55e56d26291bf2008c016b0aea7a8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNWW2350522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce48b2a6929dc2273b3248e5311e10ce077f60a0cbd37173f9d7d7757aa624e. 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/QZNWW2350528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed7d9068b185226f980d82ea22018549d063fcd51663cdd4d2a488c173a2b27. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZWFH2345676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8492e8ec984b4e7fc0a57be653fc8779f1d1c80a1eb736646f0ad24995135cf8. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZWFH2345677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4651f4064c4b7e9d9e1dfb72d47208b0c18a3ad9bd88159e549de537514452a9. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZWFH2345678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655dc137d4cc3c2ac8bd1638e546b71020c000eac5068dbac2ba8492c0b436b9. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZWFH2345680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896961b92609002a4c61245f86e9bb6d03370d96d2ad0b6159e6254f7538ce61. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZWFH2345684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4f8a22b90aa591abd649dc493daa8f2e562d1b31323743767b2f15e3e784fe. 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/QZWFN2338276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d01197e9c99122f606c90974a42c90af5163bc96d981b932a722d8c667b59d. 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/QZWFN2338277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5df8b457e2f0cb241e8818fb0c3851d7d785cabd0e8222b49f18d5baf447fb. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZWFN2338278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974db463d37a1f15ed1b7246e049f7cccbe8e20936bb24b03e9f6f8fe288d6ab. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZWFN2338279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a318f8483692e5fc39fb780cfbcf87d1dfc695323fd4edd38e7a1eaef2be6a. 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/QZWFN2338280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb68ccad12040b2d7ef3dd17deaaf61d8ebdc338682b64b75f986356419b7740. 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/QZWFE2555850.