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 0xb67cc10c17e440a55968f8214003516f1ce6597195e38541a5cdde631e59f997. 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/f8a7f40f-f76e-480e-8091-7b5f01d307ab.json and https://artists.proofprofile.net/proofs/artist/f8a7f40f-f76e-480e-8091-7b5f01d307ab.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 0xde55850fa27fd76c6d7f123fb2bf562aa5e5c1e2d50b1d77c076afb270d52a62. 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/DGA0Q2384798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c5b52a07b64645adba9c41cd98216d71cf81c4eabd9889c9646858479967b9. 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/DGA0Q2384801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94381c22cade9379d160ff1265d4bcb96fbde113934201ae0c12017242ae4ec. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/DGA0Q2384803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5176566d82b4159bb636aaff89fe6c1e92d613324018685aa56706abe5bd927. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/DGA0Q2384808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c42cb304bfef9ca4c63a2b8470eadc8e52685cef27506f8994443a9269b7d3. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/FR2X41846332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0619e841610c1434f0ffc2cfc9bb9bd9a836527ee73a1a5bcdb78a170aa95cb. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/FR2X41846338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0c27e27b09bb393687c528f6b84a96ab76f02e25b9fb6f585126f1d3a5b68d. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/FR2X41846344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2c8ffe31dc372846d8aa10c37e12290c3858a279efe69feb90acb6ad278caf. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/FRX452423196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8200e9895474b0821dcb2799a3c940f5cf4468fd2d540bfcf91d937cf5179f. 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/FRX452423207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c80df9ccbf12bb54252e68b51b9436cf2c8a2b2f98ea5e8c73bc6d461e30598. 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/FRX452423209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2208a3f7c1cc32141363a8f976a964409426de47c34b88c770b4343e27b03fc. 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/FRX762432165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898f1fc01a60fd7b0f4ac3903d9b39e566357b7a7415fea1515cbfc545b7ffef. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/FRX762432169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa373387a2bfa815684c790711edfdd1eab22f26f77800ab34f62d480822d5052. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/DGA0P2474396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0fede9f88dc78825967a3afe65a1dc01d17b226c2c38c3eed65506cdcd9dd4. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DGA0P2474403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0904d08129f950c186120018c10e803c89c1073129875e58da75b18c2a03f8fe. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/DGA0P2474408.