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 0x80000c343002473b9e73763e6de0fc944e2d99054ccca6bdeccb1a54df31a30e. 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/9c2d54a4-c2bf-4fcf-b385-491a5f3840b1.json and https://artists.proofprofile.net/proofs/artist/9c2d54a4-c2bf-4fcf-b385-491a5f3840b1.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 0x70866884499b8e93bb6a61b201bd99cc55487c05502149b77cc085e23551d56f. 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/QZTAU2117463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f9032e24df8c29b27c4d5d4e3154838319c60160e4d71f59e288ac2538fe8f. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNWU2253593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056218c47f687ad011767fe39738409b0d20dd42e50b1623f3fd015e22edf6a3. 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/QZPLR2284213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0261df51377e8f2e84a97656497f9e27763ce77543b7b5e517810cf03bd14810. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZTB72276666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256e7a7908fde4d9b6f05337a72f1c57ab8634d2607e140c2f5ca6d3a962e770. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZDA72389852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb10efde19d0a4aefdba381dc679f7c7f32e0d1d8b4c02e43ad720502077683. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZHN42320938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd9a1e62bfdc6d59fb393b66a80986e76cf221b0e412edb21dbefa9bee7a95d. 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/QZHNC2356207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304c1f14b37e71d138aa28d513d58a94a71a9bb8bbd7c779e1def185f5033fab. 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/QZK6J2328990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77573903920b3d474ffda2b71aa7d3cc4d7539c09558da7134e3daf4aa31cbc6. 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/QZK6J2328991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb697dd7da4d4610656ae2ab8f545566aa808b80b1a72a92f51782e1b6181ff4b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6J2328992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4cae8fb18743c7dcbc26fae8a7cb240c953dc86ece2172a7aaf68b3685f0da. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZHNC2337129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2404b5e1d3f5cd055d4c54106d44fdb34d1ff23edd8019eb94037dca570372b3. Chain 2 (Bitcoin): anchored in block 958143 (2026-07-15T10:15:04Z), 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/QZPLR2347543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9f06292f4eaa45be22da6143406f727d4a577ed7553efe911c00ba8d0fd600. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZTB32389068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76363a78dc7b2def7315c9946cc1cc8e8af96dbf3ced90e98a7532bc415a905. 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/QZMEP2416332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2945533ad706d84c42d3cca4e797ec5f4f55aa062652bf279736aacd3ca387a0. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZWFQ2439188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d38714137ad775be38759a6af7c185f263f216dcc8045f7336d995bbfa325d. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QZTAT2416579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfdfcb19ff415e6b8b7af6abbecaab4c410280b984e56e2423a6b7f0e5920e5. 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/QZZ7T2480074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b15f8edcb6b99c3af7a636396e94876e64df8828228f35ac02919d71851a7bd. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZZ7T2480075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2945533ad706d84c42d3cca4e797ec5f4f55aa062652bf279736aacd3ca387a0. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZWFQ2439188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd657ce8c8b4e8bb037a2051fb3b7c20fc801e694480c8bf1396974aa87eafe. 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/QZNWT2550674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8acadd3c2a35ec9c05eb8fd98457ecd6b0ddfc8c7c2972df531ac63a64ce816b. 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/QZTBE2512757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ede40e700b86c2f5fa8d9e31cd49aaa85e8ed5833d1ab06ef526ac995b19227. 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/QZZ7M2591916.