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 0x1daab42f27fd996ab4e3967b6b8f43d104a2da2a71c929a67d44e1e3e34a9f45. 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/332f41d0-a592-4405-bafc-9f1226c3a494.json and https://artists.proofprofile.net/proofs/artist/332f41d0-a592-4405-bafc-9f1226c3a494.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 0xedadc69226ae313c74b4e1b1b909e28f162143556d97ea6084d35cf64d7d396c. 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/INO131602205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83da87cf5e1094371d237dda5a4b53e2f7dff88934a806ae9b96fe0924d3e28c. 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/INO131602206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7d1a1a0d5e83e80fd3e4e5d71641e4475ffa66616ce2dc500e1b2588b3247c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/INO131900108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ec20f3eec3c63d893336ef7eb927413a1e51387c44d39c04df87457e601c0f. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/INO131900109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a18b22ad60c66403d597074f7db49ce789ca0d3afc13c9d3ce2fda7ab27e34c. 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/INO131900110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6daaff8f17b0bd96b0e5bbf4ffcf56a218c1ef93846051933611807e226403f. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/INO131900111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed0d7f503a0b79873e8af15d322082bf83109217af86ed8da362dbdcb439452. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:32:50Z), 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/INO132001117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32f8e288dade6ff82a78e0a026e3a6b5fd0931724181006cbb53a40af113163. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/INO132102422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af9a2f599de8b2e8de11c1bc5f76bc25e75b2677b2e1a7d001dc33f1214c4b9. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:21:08Z), 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/INO132101525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784fa7c21503be0e1bff8467c92ff5f31ce27b6d9576a04dd059962f82f3167a. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/INO132101905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf543b5540b4bdd676b4c58b417d2038267a549f71c44cbe23a321e8896a133e3. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QMDA62292251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68009b1bcb1a7e25612afea52bf50e27ad8a373df29cf487e9a87a72c12f0642. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:26:41Z), 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/QMDA62292253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a596e95c232ed2f7a4e0c2d19473bbad871ed3594a336b060f198f8ca14c794. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMDA62292256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e765c41f360cb38bdaa1099871136cd6a623e7404aa3fc21e5c93c8853ef3e9. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QMDA62292257.