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 0x8991289a2d3dacc7534b48db2b5e2a21b587d4476e21adb6b22cd723131df88f. 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/3079a308-3622-442f-84ca-7fdb3a3c5993.json and https://artists.proofprofile.net/proofs/artist/3079a308-3622-442f-84ca-7fdb3a3c5993.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 0x8a68bd4f013de0c44d71be59a07f1ad48f0a3243c21ccd687f7d2038a9bb50cc. 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/QZWFM2310907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e272aa45d254876ee99496a6710e6a5c4bf40851bc0a8e11b1697decfe28783. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZWFM2310910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3be2d094c82efe3d6f91e4c777ef762d28dffb58938f14875891a97801c9854. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTBE2395032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2677c8c1f5398e28d7f027526ddd6b828b35677c12aa1deb904f2925d6e400e. 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/QZFYY2295657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d21deea32de1bbb81ef6b893d2b8eda8a562a68e90e708311abf436499e852. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZFYY2295660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbcd8170fe9d88e739673296ef889164cc45e5e8559f7a0aa817da74e4d2f54. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZFYY2295663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63336b3b8ac593a991d73f4e1a5a71fd6aa822b62ccec451d66a0ac16cd2688. 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/QZFYY2295664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d8c75a760d54db238a1879bff94d861cdf430b98f1dcb2ef99a0c0bbcc43f9. 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/QZFZ72038862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacd0f72f2fa1351ed6bdf4b001bf13b8744fb7cd65b3da46262f02f964d8fcd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USLD91720429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa821a47dc549fff5cca783002aef521ab251afd580080f3bebd06c8a0b579e0. 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/USLD90814320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d466fcd03d0fb63f37cd3a69e41cc3e752151aa9ddd4b4c5c6105620398f3d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWQ2421887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c7e28f8a775ce47b177751bd63b6eac007f26862c8c29e360093d67e0b63d3. 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/QZHN42104667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef56064d226db926f1f46b736744d133015e7e552649eb9428ba2d5e2780f8d. 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/QZPLS2024629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e03269c881108193694e1398a5337523c747b6a9553cc61eeeafa186e67277. 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/QZPLS2024631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea134f016e5900f6aa5002520ba439d1114fdca9ba9c5fea71fed886230d171. 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/QZFYX2013014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44227c9c9f43b59adb95aed11a26b415a4df170e27d7855228695c1eb9ee030e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMTND1101715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc8af201475e535066946308e5811e20dcf6c55c98282dc9ba23e30b1ad30c9. 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/USLD91717066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbec03c3a6e59277311d77b45837e375c19315d5c39b373bc17830cfa058e8b. 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/USLD91713269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d7940a191f26718e8af536adfcc9820ac375d282d96a5f5273e8baf3ef0dca. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMTND2300148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79dfc2b74a2a9f0d18c855a22a01e3e0e43d577d86a9e5007446b78c687afd9b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHN82292066.