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 0x06796626d3213a51cd81a22e3eb5ee64c130f386ee365e920206b38cd322efef. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd36905f-2786-4835-b150-cd43b36a4c2e.json and https://artists.proofprofile.net/proofs/artist/fd36905f-2786-4835-b150-cd43b36a4c2e.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 0xfa71dfb961048d89f0d2050e887a7da13d6fc0144e24b28dfc739f9b85cd2db4. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZK6J2354939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f726720219a650661c55a41ba2d1ef4bdbee483ee4ffdf781ae274fe2f745e1. 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/QZMER2388374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc6ff78c402935c68bc1b7459fdcf0971d9d3b8e0c6b390c6a4e1e1de5364e4. 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/QZNWT2315008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a08acb89e33b25c073edf0e4f0aa24ee7736fd1cbe6f4689241308bb984867. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZNWT2316863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3538495e22785fa49fb31e74e17dfbf35f2d2985158b86fcca869649601ed1. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZNWW2394677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x306953388504661e2c6c4c69ed72ce2d2969bb266b39ee0588762a65f39a63ca. 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/QZPLR2353482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ee3bc9138e2ad01eddab456311b680ec7a557b26cfa78acfe9468a80c7325b. 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/QZRP42322884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ac64620d04d6aa0a8cbde9e7da414fd5b1ce8e65849d7512355ab7cb207470. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZTBE2348760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa06b720c479bc43c0878de6120e691d37ab64fadeb7c1e8c84719977011e57. 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/QZWFM2349642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1161464a037975e6316bee858dd52530135f843180d83dd3ee92f1cbf142cb93. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZDA82471420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e18fdfea278b5369fdc6e529982d3460b1f79856de6d567d9e33db99ddb1f0. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZHN72426873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b2e508496e889a98a2be411e3fdcd3204a8eea53d2390aee517c7c1c228680. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZWFP2581689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2ecbaf0a19d37adf297c8031550417f56ec7a9024951e462b537ec8c71a88a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3FB2542438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7004e8aa130eab4de6287640dca26cf6ec40efd6acd239d0329bef1f08a7d2. 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/QT3FB2542448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722d1c201424ded4854075d0ea49d4cf57c7f485169ffb0288573f78adaaa2ad. 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/QT3FB2540057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf22596e73e737e96fc59a2caf5d793b8601be44fb2e035051cf5fad88a27bc9. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QT6E52539643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef195e378f2342ce904c0984c5e8bffc1d70487aefa7be77eb9f0b12fed0e48. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT6E52597596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b59dc832ac37162bc04837653468f65280cf42b518ff12a44f095bd99288bd. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QT6E62503062.