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 0x881f9595d7d970b2b44cf4a4d27283f7f34d4c5cddd2b6775df8c1b4b3dccaa0. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb7881ad-ab72-42ff-9d9d-f1db6b351afb.json and https://artists.proofprofile.net/proofs/artist/eb7881ad-ab72-42ff-9d9d-f1db6b351afb.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 0xe33e1d058328a17450b4bf0d667123f4b2196a901e95a00e62143e1457b4936b. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/CH6541996806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9303fdada6cc3e2a63ce701161fc235429c166c6884ce5fab7d27e35f08a50c8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CH6541996807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd68aa02787a6dac5b63ad0334191e3660b691a2b94cb73e60e3d2c26e722a4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CH6541996808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bc0a946d4e682c253599e21d7870a5fcb0ad50064e7dff34eb782d043f1697. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/CH6541996810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf7db5ef5736ee330ca890191c9049a55dfb5eddd67cf81b558004fc7c6c275. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CH6541996811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76455262a4e6ace4f3d27f504c7d59d29de44cd6f025a08ff50e9227a1da6aa4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CH6541996812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b17ffd523b82d4b47be9f3dfa6372765a08d03e348e107387ff50335c4bc21. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/CH6541996813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b88597ab20df5c07be5c905ffdcabd1b672c431dab5b6e6904ce9c2f1c626a6. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/CH6541996815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679193aedcfe22566357460bf59f11e88d9c8d5edbf7cd841f5060927e3097ed. 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/CH6541996816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680185644bf776b33616c022316ebdf643e00db43ddec03da66759cc7099fd4e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CH6541996817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29382fd93d3e9bb2a7cd97db81c75813186908122aebbad3e4beb824b9a1224a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CH6541996818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2653938e7b35d8f4d783f5d070ac7e42a2c8cdba902f7ab0b3b6ca99d970cd. 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/CH6541996819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70916f889e71cbae77a916606ae51e89536fed575a92e474a9203780619439f. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CH6541998588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b46b6ad6738711808d011ec956bee2eb54d10761f7bb6e41544c50ba2cba841. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CH6541998589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901e9f539f4f7544f22393ff0773cd2ca9de8125c300a3f684c15a2155451478. 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/CH6541998592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3bed10c4b98a4f0bd9b5b354fc53417312e5204303e7b233f9f12ae868758f. 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/CH6541998594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5bef1ec187d48ae38bbe77ee863fad0b843bbf38d5349d06ab891cde45e306. 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/CH6541998596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9bbb1b00a0395e64f3e2d98ebe101a847d592a6ff6f4b0f6095a2522ee79857. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CH6541998598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3775c4338ce1e03f161568908bea85e1dec14917908cbd633d9d56aa13ede06. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/CH6541998600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49b0b5ac68ca8c76876b2ec198fb02eb13b696a5b78845db9d1787ac3977d49. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CH6541998604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6891e2ff763859c9529a3de47e4fe887fe47f9f8389b760922492a9dcc48bf5c. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/CH6541998606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5953eb207d6fedbc14dca23fb73e14c6079a7f02cbb500630fa95768478651. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CH6541996787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330e4b32b6c8232efe971b9973f0dc402e3a2c16b449ee6d1f1e397c5022da4c. 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/CH6541996795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ab8051dd8cdbb5d050f3246aab1a7cd823608ea7b1c1cce11afed4c4e65a24. 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/CH6541996797.