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 0xd1d4642db401acaa44b416371edbe9ea123f3ae19c508c9a0d18b075a21f1e5c. 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/25b139e7-4546-4104-aa06-510614d70ec7.json and https://artists.proofprofile.net/proofs/artist/25b139e7-4546-4104-aa06-510614d70ec7.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 0xc355478c51ae2c20216a8cad1233090aade678e5cf0d9d67e8c8bb376dbc8e05. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/UKACT2370595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc9345e6d0475e68749d59eddd0bd4632667d43d6e23427cdfdb70312206e31. 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/UKACT2371669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03c3d493d55d7020cb5f906b6077f81e18c9f20f90032ef7447fa2b55d0d7d0. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/UKACT2371873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2730518c610e9830307b7b103a396d6ea2ffb6c786e73f618610759016b20e. 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/DGA052327699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e07a271084564992040d493c6afe1b3f6507510065e2b07eae608abe00fe06. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/UKXN22211411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbee5f208bc4525ecd2bafe4630178a4e49b70cbdb8685d87ac8e62ef7ae8682. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DGA072369523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0b6d112c3766e307fe17b4e117159bd67d29cadf3b428d796b9817db870aaf. 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/DGA072369528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126913ca4b9ccd86a8808b3a9231cfb68c89fa3be83f40c7a025b3bfd79a8dfe. 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/UKACT2370079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126913ca4b9ccd86a8808b3a9231cfb68c89fa3be83f40c7a025b3bfd79a8dfe. 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/UKACT2370079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961c688e765ccc0eb9112b523a37324c3a4f320fc4de2f4ded19d9e351da86bd. 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/AEA2Z2501885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ff4ab09ff53fb886e51cf12e35462fcbbd92e51cde0ffa762461aac25aeabb. 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/AEA2Z2501886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc79f3c11d45bec6c767bc2ab549ed5f152a2bede07e3100f74d64bd3cd1a3c3. 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/AEA2Z2512464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65cd853026b751a4167060331e77db5b13846a071cdee07ae0390da174c2608. 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/AEA2Z2522338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41cc422a46f3add092bb9b975eb02057c78d310ae07de119a482674530331650. 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/AEA2Z2541031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a39e0daa871dc782a4dbede6850a6d1ae9ca64d8e95f05089de910a53ec4d0. 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/AEA2Z2541032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9557fc4fcd20de9bcd79eb2a52743dd623c982bcaa8c383d9faf8ecee826b230. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/AEA2Z2562634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9684186dc28f926bd2a6e261320cb2c0bb9fba01e004dcaf4c7f26b67d45e8. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/AEA2Z2562635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2aae373c5193fc6b9ad8119bd4657f8f8b7317cbd0843d4b9b5a93ad15d0e77. 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/AEA2Z2562637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf12405d369f2a88be63790a7d6a9fb6dc726540080ebe4b318e5ae2986a8cc. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/AEA2Z2562638.