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 0x94035ed5dc3a28e4f7ed25189b5240df4fc8884d6e8820b9c6c6034d898e50e4. 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/f47bd045-245c-4162-b139-0a12a1c90c6f.json and https://artists.proofprofile.net/proofs/artist/f47bd045-245c-4162-b139-0a12a1c90c6f.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 0xc6dd49af1ce38717740918cc920ce72c10327494af7ac9ebfb4bb68d96900522. 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/QZAPG1806021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b6176ddf41055f7c137b71763189c502a938b27ca3ef6e9aabbf9cdc569bf2. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZDA51928670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3eedb12b21c642e25533bda498d030cbf798f9d03cd1b476b47c48a2986f60. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN51922555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2146fdccab21895c0398466c5a23b9c00e8be2aaa3cc636948f2030fcd4a6c8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6H2213188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb10edcc085fb11bcd5e7de7155ffd1e03d333583996d83e58d2e077d320ac7. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHN62445501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32cb8a2747dba81b084a4f02cbd5718150c13a5aff8c8a860a76fc1e90fdc859. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNJV2428367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f159dd5e46cc8114f8bf71584282a4a06483c86f1ffa1e2ddb1de67dda75132. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNJW2412015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1085aafca0335afd7d12a4761699ec33a6ee41fa4270de2868e3cf08c44a6568. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNJZ2438051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc554a9feb6c319b57017127abd6bafee4454ed60714e59d60b6aaab173dc9ebf. 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/QZTPX2416417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693d3d82d74e82fe21e0d9e32e4e3ca95ebb05a0c874e3e32091cec8b06537b7. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZTPX2416421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef37923b39c11f422e136f3644ed3f808691dafeb48223331a49a1af672c0fb2. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZTPX2416422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f42b9a31e70ad57ba28d2f774fee3651248cb457598cb87974f944bc080d8b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTPX2416420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693d3d82d74e82fe21e0d9e32e4e3ca95ebb05a0c874e3e32091cec8b06537b7. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZTPX2416421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef37923b39c11f422e136f3644ed3f808691dafeb48223331a49a1af672c0fb2. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZTPX2416422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x865eafc93dd85a4506ab394a20be3ef94654100b534dc0e86c3b5c2e4f8c633a. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZTPX2416424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1c242a8ae8abab651d17cb95fe3fc05850b623852c974ffdacf04f806df626. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUYG1271214.