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 0xe019c8eb321211e58aaead17a6551a2fb99189d3ffcd8cc348a394422d220ecf. 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/88cbacf4-3595-4dba-abf2-408b524107c8.json and https://artists.proofprofile.net/proofs/artist/88cbacf4-3595-4dba-abf2-408b524107c8.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 0xfc66076b83868758d22c7f3c7720962eca05a51ac8d39d01a50d6824180e63a7. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZ2J21505850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x529e88501b46004f64dee233bc77678244d91519d6a495cf1ff6826959260cd9. 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/QZ2J21506035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd64b39fdea87ab9177663c688a40dab7bbf18a3fd881ada848f945891236ef15. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZ2J21506074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ee59ce0a9119d19e206696fae432db9de0dbb4540663dbd1f41e1682b9f52f. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZ2J21506122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e01d81be69ef7555dab6bf0d2577112156d5bbf762c61518f0253927e6aaa37. 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/QZ2J21506158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06aa6b5aac5abe2929ced724096669f42f8e2ccc1e632944ef6f128beb13c131. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZ2J21506160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93e06e6fa84c78ac08874320487e96185b113cd9d9afb4305bd127461dbdfa6. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZ2J21506286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8777fc78d73a649c046cd1abf7a9b0f4903e2a3fa415137ff9a10afbf460d5. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZ2J21506287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d89b6b34ed7130d561e7c0406b0a8fa145259d10b9e9bc4aa4dc97c119ef54. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZ2J21506288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150772fd4e1962fd9acbf7cef7a9c37226da12af0aa6f6cf736a47f74f2f71b3. 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/QZ2J21506462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161c3142ffdf02a220089a59c89c86a1a48df96b27ce68e7876479d5ffc525a1. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZ2J21506464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d152b4ea7772d473215d1469f3045ecdc3877c90207e407c2f7369680163c3. 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/QZ2J21506465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16ff1470132478f08136777311bd1e4e321104b26e19a9f6f7b497494bd08e9. 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/QZ2J21506477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a8fa0d99c49dfd310d94d7fb7216677956c6c8fa342bb1facc8e9a19aeb792. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZ2J21506529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd37041ad12fe7d74bfc1e805d3d5750c963f759443e7060730b26bc5dfff85. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZ2J21506478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165af85f88bc5806174db7c7e57a86341ac261dd37a80afc52feb81d3d9d2b8f. 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/QZ2J21506479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb4ce373ac8d9bdd919aef3ee92b7b3681f746439741b0dc54f6628c3285c87. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZ2J21506681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c9601e6f14ead15d7fb581b1c132b5607734721d464ff92d966e660130d195. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZ2J21506711.