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 0xaf7ff7cadd92e74e1b043ce31b7ecaa1a5e4646f11712ec3fd0503c25163cb49. 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/2acd7bd3-f1a1-45b7-ad64-ea2f235f7a3e.json and https://artists.proofprofile.net/proofs/artist/2acd7bd3-f1a1-45b7-ad64-ea2f235f7a3e.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 0xefa02759d3f7ee2c52b5379720a6ef1d0b85a8fe4c82fbf4b0d71111a2a33a22. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USHM91458648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcbdaa30b39095c1d8f71061530c12f4af0ba5e2a9af549542792acc05ecb18. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USHM91458649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ff1dc51b0c82f063dc3bdfd509dff426affa3fe0644fee2fa415cdd6129d3e. 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/USHM91458650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895b0c0e269bc412af21daa6f9ad1e364c6d8d43b6affcbdd57b76a0dab87c49. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USHM91458651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b20df86fef25e60bc281e319cb4d116b0f0a4370a9d111d6491b9792d02850e. 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/USHM91458653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f56598d81006005b10235b7e4772ba3741692584ce50c5031ac4e34e8dfecbb. 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/USHM91458654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb181727547985ec45bbd90bc1570d77d1beb253af31b2bb30d9e8608f80f7a94. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/USHM91458655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960eea27b3aecf23c7048ef630097163f3829b2c9ef5eae99ac86846ada978f9. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/USX9P1452726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb824a9e54bc15fc83db9c4094e053298444626837fb70d96a491f1cd9c6f8a. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/USX9P1452728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6436cf859e589bc7556d73017c1fd22f4caa3dee821ae8c09b83e6eeb795c17e. 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/USX9P1452729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf9ff386e102a4fc376545529642e7632fc2b0b27e2e18842c7bb33945c1b9d. 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/USX9P1452730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b068a6e07237653a207c154327b64f85ba91402cf3bc2af0eec0506665afcc1. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USX9P1452731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9988ae72eea595c518b40982a8b53cb2975df16963c8a3aa89bcc42bf6e6b957. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/USX9P1452732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ae879c7c6d122cbf19a3fbe58bc53b724db8b368da1eec2179d01cfc2c16c5. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/USX9P1452733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90713c3f440709c6fd6e224661d20d5f934384a34bc5ee17cc69ea6cef1d20e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USX9P1452734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4ba14bdc30fe3e15720bab38278f32d9d7b18e02b0799bb1cf81b8c16f5338. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/USX9P1452735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0d075cac56bec99e8ea8e89deaf25fc7f6319a22b5d98991228e6749b06fc5. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/USX9P1452724.