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 0x13d84fe4fee81478d7e91fda056949410e62425b55de1c8ae8cfc47b772c17ea. 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/378ef12c-f079-4f79-85eb-054920961b6d.json and https://artists.proofprofile.net/proofs/artist/378ef12c-f079-4f79-85eb-054920961b6d.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 0xad8e6064eaad41f3a76fa871efd7a8b6fca6f9a1ed1075c4ba0285b97cc3b0af. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QZFZ32262020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d95d75b5a64df3caeb235e1ffd622e842d3fa18c54002f3d0d3c6c88d5399c. 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/QZHN72222417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5567b242e9617e7fd3a76ca53d1a37e76836f763e200a9088f9dc2b3636908d3. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNWR2293673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029303768c6e88050a742b3bf215b38ef7e0af54e0bcdda82cb9e1529e9bf584. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZNWW2276431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cbbda0c7a8f43b2f2d6101f24e89efe7c1193dde07df2935125751e2ea5f76. 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/QZTAU2382565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78044b7c8b2b84ace3ab3a1c7542eaa8d6a31da2e1fb524b982b77b6e7603e9c. 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/QZTBE2383440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2fffb711d255312ed57c7a312652f59242547ae04a5ee0390ad5ca76816b59a. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZWFE2331689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e3e6f9ef3b17d5d4ad736dcc53ba9c5f8ead343037cc819707441523140cde. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZWFR2355823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b40a13b438050e26cb24e0f2d953779646928d03a9e6546283a5a2ed1531435. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZFZ42409270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cb9945468f8040c1e3ae12ad175684a47fd5a4baac053716e38427123e1b604. 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/QZHN52433323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce5a6f90afda52b67ee7412d67cf39fe2e9525776d4801fe67f586ef47b7aea. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZWFG2445705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eecf9da818d6df2f4e3da903eb6cba9f1717ab3483c2b86113a25aad9535d90. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZWFQ2472474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f145e5b8c261970aa6ce44819464b3363b6e7897218332f76702fe2d3ed0d8. 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/QT3EX2448833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555e4db5e42a2047a7772bbd5f68d6d1673d4d6f6a4162be1a49e525020a35ee. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZK6F2568071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9763a08ed83bb52b8ebb75db5eefd5eef6863c16e8d6f94a1bc8fce9988752e5. 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/QZTAX2551092.