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 0x2f75ca0085f0ad722f32801c72fdc784ddc84a44f5221387a145fee77e10a866. 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/9c5c3610-d81d-4ed8-bfad-ebabe58a7274.json and https://artists.proofprofile.net/proofs/artist/9c5c3610-d81d-4ed8-bfad-ebabe58a7274.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 0xb06d9141e1c0367868651e3a7c06cfd2b28ec74c74a5fba084be0bc2fb12a97a. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCADW1822614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d97255549929798ae5414ff1263000bc81dcce3aca3b3ff377cfb308ee06f02. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCADX1810320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed91c80e6f1b5c9533d509c8736bc8fe6275e34ea1e5ec4884f8446d59535945. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TCAEA1820593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f4b9725e4bc38aef02da262386643982908905a6f7a7bd032e32bba8d22adf. 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/TCAEN1949507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94555997e5eaae464da1af2f4b447159ea5e6b90235a9d24cb93b6ea235fe62. 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/QZCUZ2100127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea6b47136cda54827b6b545b65d55a4596a514f4688b10c8ec9a6fc4afc4b23. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZCUZ2100113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74a8a9ba5a17e4beb796c81d0134cedf340832b82fccea0cd138c74e4226d25. 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/QZCUZ2100114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a14fc505c5992799b9fca0466e8ac82dd2e13318f13721457a2ddd4a0ff686. 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/QZCUZ2100115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029cee3c4eb3a8d3d14e955defcd5e0887971f377efb6ee29ce6bfab21cb2239. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZCUZ2200103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f801db8d5c8c8a832a08c93cdd7320faa2b6e10cc975f3f78c7c3dd73477d2. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZCUZ2200104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed91c80e6f1b5c9533d509c8736bc8fe6275e34ea1e5ec4884f8446d59535945. 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/TCAEA1820593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe370a668cfa5b6bfe544d5dc007b741b9ecb32e79bfff10b8a947de36cb830c4. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZCUZ2300072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a85ab1dd02efeeba72302416881d91e333927dda1ac7969851c8ab7d70a307. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USLZJ2438827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f8c1cf36116b55710f80b82b5def9dd2c39171ffc2eb09a051a194aafbfcaa. 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/QZWV32435256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669d822ec193b61953826c4b4b3e42f6521f3520c9c2fe32a0473d0fce4b9283. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZWV32442158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700a865cb92ec6cc6a06024298901e5717a298d4c5db531dcd9860cd4038d234. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZWV32442164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1f7b697b1628870917847443c33cfca771f411cdf3d7b54d2c606b70296d17. 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/TCAFM2159253.