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 0x25b82a9e0989967884662ae9059013a7c59bfdf871b81d7d530abee95e8e678c. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/73a0c357-d219-487b-9d27-e9a6f93ad4eb.json and https://artists.proofprofile.net/proofs/artist/73a0c357-d219-487b-9d27-e9a6f93ad4eb.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 0xa16b1fb8be8f71bd3f74aa7fca0ebaac1bdee83b6e1073f11b3d1483211e59fd. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZHNB2466531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31af958741b35c584c910c7b08dbcfbda0626b090c44294457397105249ca979. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZHNB2466532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b16f06f8bb1c546c99091bd9ac6fc4805c78a33c6d88d8e5681e8d4af63ab9. 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/QZHNB2466533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x668f1f1f2ba6e601b51f3d52a830fc5e2e0590ce9ac99502bfe57cbcfdec2d9f. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZHNB2466534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x321ae71c38aa2ab6277925e444af279dee2b6565d6bd1439e7b256e6bafb0f3c. 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/QZHNB2466535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8edd34cc1f1e28ea36bf46834dc2380b5cbfae9d58130e3641740ba5a574dfec. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/USUYG1587693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57dc848b2ffbad9cb260036e6ea6ee040c1ed242954cd32f223fce7f9fdbc164. 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/USUYG1710440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6fcee0acad7eb9baa678a5689410817fb04648e0f021e984594fd13d8d943f. 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/USUYG1713741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c93b23d7ca3636f7310ded7974eeac354cabf4ceac0c5bc94c2b7c48d715b95. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USUYG1715308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb58d09937faa11365e8015b059f6791a82767aed35643ccbba2a1c61d8cb5f6. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:34:50Z), 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/USUYG1716891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629de56cab21543c6087e19130a1304c90dbc3b8af7143795686b6954cc9b144. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USUYG1716894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1379454cc77a493a60df7e89bca01c440cf5044429ba870d572ec9d59fc511f8. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T20:10:00Z), 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/USUYG1720264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102f179f98714f865b2f7fb6727d291cdbb3477f4eed6f347ee8bd66dc883d6d. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:55:54Z), 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/USUYG1755219.