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 0xc1dfe1645e1dbcda85a52e98892e156e4f32033b08887c33772b94ed0623bc42. 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/80fb8e25-992d-4d76-88d8-9e48f83d68bc.json and https://artists.proofprofile.net/proofs/artist/80fb8e25-992d-4d76-88d8-9e48f83d68bc.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 0x428f9c312ef9ee88b5605c9da0e01c410cd5ab6af59d64b485e84f57417caa60. 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/QZES62536395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b092a8700dd490e5d65884fa22aef0977f840bc43c08f465716a181450467a. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZES62536396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b12651af60b00448f3d9576cef7e2f5066932e357611227e7ae8532a40bb882. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZES62551214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b817e7d23120d5311533b8894a204b3ecaf4c296dfe0fbbe8dc3563135a0534. 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/QZES62553688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912cd248dc7360840e958d27cc60110e3e3adad32c2e91ca4c71734015f6ad74. 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/QZES72556183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ace59e3832c971eb8cbb24f639ebc5ad18f2c72dce89a4bc45d9f6c30809f18. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZES82528378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929014a7faea1c21b493bc5b97cab467366ad090f1ab4e1b0ac6c22930daa27b. 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/QZES82531002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe099344e4a2d77f07917dd514548bf64687df4e6871dd72ea8b587b7390a7786. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZES92516093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5a9ef55f98b7fbb3cf4d28785cebd8f9f627b0cde237461ec0ac0c5965f9d3. 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/QZES92563086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57eee512da220c05da6e6101154f60896becaf806899a66adb4d82d8a7e6bc3d. 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/QZES92542539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629a1ce2f13b480eb58c545e9a5776f095c46d3dee1de9948ae4501550ce626c. 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/QZHN32501951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9b06b46be99f6501db2c281172acb53d5d124bd8100d5b500a40230274c1dc. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZHN32535779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d772bd6a5a954c1a728a1f85d67b01a3a2c64b70039157d1c85c3ef0de0899. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHN32533648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9be971be5ec02c8e3b64027fa34e90fadab62d46997eea732db3285917ba74. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZES92585590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7448dec5e9f428e0b48015f665299c8bdeeaf5e29841840b233fa60026a7338c. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHN32535781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098b761a9790750091649d597ec22cf25323e07e5d78f977b8c9d2da858057bb. 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/QZHN32549663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b209be5d29dab47285365da7cfe0343a67e1fe45e5d9e0b6c4060439477d57. 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/QZHN32549611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2edf73fe92d5d8e718c740882c0b683ec99c4e3659f179f4c3cbb27d00abcc. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHN32546210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c185d3ab1e4b4d4fd5adc27ebe08361aca84eb1673b243d09dbc0e175d629c. 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/QZHN32549666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9bd7766874f52f3c93b9ed753a58f28c363e3be3b980dd2a9a7a76282f30b8. 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/QZHN32546222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f4866ad50e506ea7c8a1f3f98af7eaec1b0fbfe109c240284d88764a2f27a7. 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/QZHNA2592284.