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 0x4475cadab6910261374c4bdd5a760d5ef7de43c98d5f0440b901a829268ef027. 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/cc19d5b4-931d-4fae-9298-af5aff922389.json and https://artists.proofprofile.net/proofs/artist/cc19d5b4-931d-4fae-9298-af5aff922389.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 0x7c8966af7a1f5dd5c7da144ff6f760e5e9bca913192846bc0bc2dd8a164988e0. 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/SE6QE2021734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2ebfdc3fb405cace980bd3abfba9e89835a720259c07091ad3bdb9a2f195eb. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/SE6TI2065719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744ec384680baec82caa443e457bcfbd08ea4317bdd1bfab877ca1722bda8556. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/SE6QE2286733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0092f7914b58e86417a2f7ac78296e4560e2e5f941fcae9325f0d3dc07aeb6. 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/SE6QE2286736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3f868e1d7b714eb21b2ead8532581bb51e4cdae1b306c6954c1ca58af92634. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/SE6QE2286740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994986b9c99142ae7a0417ca72c49e35d42cc23c1f46d7bcebb151f588283069. 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/SE6QE2286741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f3cbb3dc2102a5bb4944587feebd6833d48c7b8645e7cc0d5f4d01022f4b28. 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/QZTBF2485603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d90e9d24cb2b31c3a196d3ef14f2a50d64e1cdbbf31c97d0ade9d1b9dfe068. 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/QZTBF2485604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b85c91a3d287d53f1f350c1c27e317b2124f007a5e998c08dd0b6d56a5de352. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTBF2485609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24af085daf77e6093c27449b9defc9f6fbee0d9d195cacbdc6fd3b61cfce6fb0. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTBF2485610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0401bc8655d7257520dcc7dae9751e64398ea2f17aec20613017984b3d24ebe1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTBF2485611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed342f720595668af0effacfb0eb7d904900277080ec4049760144d874436d97. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTBF2485612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7181b764c45ef74baa93a1c8702cdb4dae4d70c16eb83bd564768a049abdfd1e. 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/QZTBF2485613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3c6171919bfe8dc3e7a66fcf8bdce42de94c06d14989fd4ed2ddf0dadafa7c. 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/QZTBF2485614.