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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8875580e7941b069ce2eda025e7bc2f5dfbeda1cf97b8cf7e7cd0828a0f869ec. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9aa004eb-f482-4f95-b0a7-ac603e3dabf0.json and https://artists.proofprofile.net/proofs/artist/9aa004eb-f482-4f95-b0a7-ac603e3dabf0.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9624f7f900da8757aa45d70d3cda07c62354dbe0ce2803535e1ac5d80588192. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/USL4Q0849491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02144a0e8a3da45cc4ff4e2e1180cf2dc7adcc3a48578f5cdd34ff93e998ade. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USL4Q0849493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016f7f14087718e165d5a66a45ef3cfc0751463006c6a8a7b441878ab6a7d826. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T03:35:48Z), 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/USL4Q0849494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e0ea860275433778e5e78acb54dbbc8f44483113167e2d61774ee9e0af4145. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USL4Q0849496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ff0372d722d7c58394a2a0c2d61f8347569bd2e3876b32e6df30ab55b4fccd. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T16:09:43Z), 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/USL4Q0849497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a45f25e3545ffcc9cf08b07344bab9ac8fc229c2216a784de55a886c639c4b2. 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/USL4Q0849498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742edf532429abe6a204104d231ba2669c720ea9286e54d4726228b4f1c7de00. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USHM81532654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636fb152a695908fa4780f00f042a8aa07782979f19ec05ad5231040cfb0e8d0. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T18:47:46Z), 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/USHM81532655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68854b60990cdb1712f53618908689bc4d6da6be2a32658d74a907de53fbd3a. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USHM81532661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e79bac4ca44231a06e1a1bf599f1d24941638b12cfc574edf24cd5439ec75fc. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USHM81532662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796f977f3a8cc556536632613b33c0cfe3a898e1b03eb43be35b27a9cc66afb9. 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/NONIX2301010.