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 0x10676a6c0213e381425e74141a7006ef639ff37e32627800d3e19bf9a45bb661. 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/702d8d04-ba15-4e03-8085-309281aae7e8.json and https://artists.proofprofile.net/proofs/artist/702d8d04-ba15-4e03-8085-309281aae7e8.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 0x29eada52e78db2e965514b7359705a728fd81b76619fc6ae78d532159bf3c30c. 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/USSD11300437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044a8a229a8558c2d38daa0d8b95d6eec10bb692facf4a5d158d5b3e932dd1cb. 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/USSD11300343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d39540978697c2a184753ce0a5ecda0fb7365c0ff06edf78dfb81aa8a60441. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/TCACA1416822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd67976c89e9b97b8c25ac3bd295d00275bec2225bd9c21cd3840714fdf7a45. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/TCACA1416843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f17df821496753ddbd8527896bd9a26139f7621d9a03c7251f92ff6ffd8f81. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/TCACA1416862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5346da60224c9e29fb7965e097320af048379c8b1681c6c4e489b141dea9e4e3. 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/TCACF1540049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084ab1584034a8faa92113ff85925f06f373a54202358fca53d519e74b850e8f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCACF1540074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5507a0c462241627f8c5ff9b34d68b7bcdf849813899d56197e1e2fd4abefa8f. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/TCACK1522732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4cb2162d350ac9cfd3409f51ccd32c4d2da56bcbe5af7072ce31dec7a64202. 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/TCACK1522756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5209c497252a049d2ba470afcde25384f2cbcfedabcce52e2768814a7877146c. 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/TCADR1880764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426aae9ee3639754d1c6042cd605fb128be985d01d1b55ae4b612c98949ebe14. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/QM4DW1762576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7cfbf8a4973b6020b70baf004ba4de4d6a41d78095615e1270236dc1cb309ef. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QM4DW1762578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9fa207f98566609011f895ac1fbbe7ca2fa2094e8f9ed11e63b32902d162bd. 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/QM4DW1762579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5f3b134b71b381c9318bfc4cbfbe6abd612d7d0f5cbdeda1e4fb68e15c2766. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/TCAFG2013384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09dc49257c452159054b151573852964e298fb6ed3ee1bfe6fbb692349fa2cb. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/TCAFG2013413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a76a88a4bfdc4f4bd662893fa648c480143995383623dbeabaf90984536ed8. 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/TCAFG2013429.