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 0x26b05390da0def49416d3608e73c243be2347200a4c9e88aa2213d5c4117e651. 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/271fe1e2-47c1-4e88-90f8-e5a5db5df296.json and https://artists.proofprofile.net/proofs/artist/271fe1e2-47c1-4e88-90f8-e5a5db5df296.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 0x64fb7ff1af3f884ea59868decd79abecbaf1817899622dcaf1cdcd958f314519. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/DEZC62269330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2248fd6c2c1f4a7c1862d73d73aa85d64e07cd20ee98127111850d10a75a9145. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEKF22201057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f8f8d6237dc77a204ac0c2cb02beeaaf218f4891234502ee67a4382e7ae5cb. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DEKF22201280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e0a30e4aacb1b5b5c665157d005522c82ccf5576a9fab3cae7bc46c73eb490. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/DEKF22300035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfabf433fa087d1faa1b585f68ec350737e73479186dcb6cda33659a8daf3a65b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DEKF22300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e94c09956abe38b9e834c6fe490dd4d91df8e6518190bb7ad73bf6354aa98f. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/DEKF22400729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498b15612e6a31966867f1a52a96df4c4b51d131f5cac4128a5cc8cffa8cb3de. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DEKF22400785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb294b06e4afd23d4fb138a1ef7df66db903c7e7017d3aa709e9a37a92b72ffee. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/DEKF22400856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc8dca15be7127461ea6bb31f2d2628b5f73f808b4b9de574777f8c91f196ba. 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/DEKF22400855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e94c09956abe38b9e834c6fe490dd4d91df8e6518190bb7ad73bf6354aa98f. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/DEKF22400729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57be9e003ed67a64ac8e3ff02be032c497ec49e8129ace2aa52e599ed10c0c93. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEKF22400857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66a6370157e7ff38f29ee5490310aa4671ba412e91e3b47317a72378febfa3e. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/DEKF22400858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2712f9588dab44826899508ab97d8dd3cc508ed86cf084c9c74c13af62711df1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEYF12300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2712f9588dab44826899508ab97d8dd3cc508ed86cf084c9c74c13af62711df1. 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/DEYF12300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd95bb809fed7aa127566206df5c61274567a263a62dfa2efbe4b2b0b16a2ae0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEA622402326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd95bb809fed7aa127566206df5c61274567a263a62dfa2efbe4b2b0b16a2ae0. 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/DEA622402326.