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 0x1177e1631b333e63ac7e10c6e64507e293ad09b057c799c5e6c0ce80afab98b0. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc3abe79-c7d2-4568-ad81-88683e9e36d7.json and https://artists.proofprofile.net/proofs/artist/dc3abe79-c7d2-4568-ad81-88683e9e36d7.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 0x0fe56bfc7b77f2d916b78f1fb8db2a144705d3294b4e0933159335380ea182bf. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/CA5KR2147247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62420c451ad9a06647846034c06023cd91ac8770c05bdb9ca0a79a50f6ad7194. 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/CA5KR2147250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2abea470ae88642902ffa900a7167a3a1241ac367fb238cf5e51c9e9dbd1d8b. 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/CA5KR2187482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b359e11a7ac824de774f04656577145dc0ba3f736bc7fafa5be6233e5bec1e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CA5KR0033634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c1ac611e2ca0ecf2a84f1c8bb3288d4f90fd8da52158488c1f0bdb0cbbe130. 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/CA5KR2241480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e10229c97f4b41783f6642fbdbd62e22ce5205d0ced0452f413cbc188fb80c. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CA5KR2349666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411567596ff3565c1ca5b35306e34db8533e94ff50fb6a6c960bd26e06f788cf. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CA5KR2397250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca99ac203b4e8c2749fbbd1ad116074905aac12f9fd02e0b9799de4bd0a1d624. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CA5KR2419073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce327af32ade2a93623a7a5f2fa4fae2fc93b242bf69b84eae43e8dfaf974b5. 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/CA5KR2502167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158cac8d3b0b937ee2a0b2ffcf3233c2f48db4b2b5fc1a0b33fa8093fa81a1a9. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZVEM2562078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46e30ba686a1f2e500881e0828ad359a34b6c07e4a4ce724a22fca705c6119d. 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/QT4K52507593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035fcbb43aa53011ae2d0c1fa72ca9379a66a6b42a41ffeeab0cd0d209908cb9. 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/QT4K52507595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161933de4adc5cee79ea5d877dec8f40ff91884df20743f733525dded9a1f407. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QT4K52507598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe56ce88853a5f9fc41ea40c864140bed88f287544d012ee99555f3b4292d044. 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/QT4K52507602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x394024da6ca0b47986d3603b566431c067ca444f144e8e60d88199401329d0fe. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/INSB52100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399ede155edce54da8911a9d2b2923619bfa475031319b7a411a4817eb659fb1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CA5KR2222792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d92afe3b76d2602b5cb180c2a72c578cf0cbfec02004b848079a8d525c5620. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/INSB52100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1e3e64206b43af03aa5c88eeaaea0fdde50d5c76b3c5645ea198ef8ce9c12d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CA5KR2147246.