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 0x8ca67309dba34dd56cfeb3cd3b1c0695d13d5dbde5e999dd5056c84acb4cb632. 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/7d309483-b08a-4eec-aca7-9318df648078.json and https://artists.proofprofile.net/proofs/artist/7d309483-b08a-4eec-aca7-9318df648078.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 0x3bdd9054259a41e291d81dfed8a3a946ec9ae55dc2765c750b78a0f13e18a346. 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/NLV5Q2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b83e55e57936137f9646aa677382f0eeee05d1611c1ff503dd355dc4de226bb. 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/QZHN62145734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8261fe79a94c0ce40e12e187db282e462b6d16c6d9a7ee5bab033959263f280. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZMER2189159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0086940bfec41cef4273ef57a3af05e030dc7286534d712a2d3b3c2c021cdf. 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/NLV5Q2100056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fd0147ef1ef161a84f2c2700ab3da558bcb05773554bc283e2133aa06bd5c2. 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/NLV5Q2100058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfe089b063d9eb517829125b204c0b823ca3f6527ef9e8a7289a48426107e0a. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/NLV5Q2200031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14c8583622882e253b07a74969bdbe711d08f2449f6f5761b64f49e9e3a1841. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/CH6542294968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37abc7520570371e19b2245858fd60bc4ddbfd0edcc6bee291bc91936cadb092. 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/CH6542279867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626ee752d1ff7ecdedf241cb12e12b2039b138e73051b543d6889ae444c5589a. 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/CH6542294961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee93fb62fb7b703b901c23c10dab91de3e96e5e2caf8392cf8919b13c56ff820. 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/QM4TX2310492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b90c0d6ce620dc9948bd3a2866b9907536bd3e80044d5e29562499f5d849075. 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/CH6542345474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d98e0872ced5246d027eab00dea8fa394d6de81437c049ef9c12d014fa7278. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NLV5Q2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1c869678e90e4bba9f9335e91a4c41b8471666019a787a99a6503de60e9e4d. 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/QZVEM1874384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96dc19b79a810a969b875db3ba5572a3b6b4cd24d65c9d88c2d709ca4af20b53. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZDA42441440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658a67b0d67a5e9cb36167b05ba1050e7b40da852617c537f1c45346e5881637. 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/QZDA42441441.