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 0x712acbf23b41f666f831ffabdea4ce98b291ce211364bccdb55cdef913d002e0. 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/ffaeb2b9-fc51-4c61-b180-d1d6d3b0eb81.json and https://artists.proofprofile.net/proofs/artist/ffaeb2b9-fc51-4c61-b180-d1d6d3b0eb81.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 0xdbdc9386a09a7f903411c1eaafa9d4a18f7eef05b68c11f30e78e967fa52c983. 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/QZTAS2134637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf89a0e5362ae856ae373d54dab670190b703c5ebac03c400b8934626432b24. 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/QZHNA2216533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb017b3ef0cf7ebf11d9d75b0155fc3d9a1cba71b5919f56e2cd43889234ef60e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTAW2251003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19563e4022e327feb7c74d7eaa11d2e3d011c65ca8addff7edf75c5535003638. 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/FRPZ92330150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd167eb38a0e6177165fc961659644602dd49b4ead2d6f62c73b4435d95089673. 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/FRPZ92402020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1678713b0b4accc7cb71426ed368d7abcc71fb67bdde5de9ae7977a8d145b54. 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/FRPZ92402290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5748ee537e61b2f7ecf7da92b088fea2109dd7a111dd20570a93ccc9a0025118. 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/FRPZ92402330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2752d1e774eebe589354b3d44380f3cb9bea747c133dd3d805d6941cc4f6e79. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/FRPZ92402340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36ba17b97be9b38ef6f55b11aebb0a3f954ba53ab71f178d51a8c7e2061a643. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/FRPZ92402350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09cc2d5fa2ad4358968d01becf61ae095de67d35e6fd13f9fa04fdedb5fb977d. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FRPZ92402370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04762e8fe4b8878f98d613ce328391671b06c1123f972812d54a2ee8651c25ed. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/FRPZ92402380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67cfd0f3850ba8d35cdcdfb0d1de36dfd5d725a26d95da811adf0e0a6d09dec. 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/FRPZ92402390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69646741fe25921491e3a8f74f701ab3ad4f0db45271425a4f3369f1d141c97. 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/QZTB62233405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7cc75b4c61cf36107669ffa39c931d9296434d2c3ebe4b360a4bf0d4275014. 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/FRPZ92314480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69646741fe25921491e3a8f74f701ab3ad4f0db45271425a4f3369f1d141c97. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZTB62233405.