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 0x9d9531250ce29a473d772b263c94f240661c78c5c559f5508832798c74de5e10. 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/983a20c1-df7a-48f1-ba20-d58034b2844e.json and https://artists.proofprofile.net/proofs/artist/983a20c1-df7a-48f1-ba20-d58034b2844e.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 0x99db9921e46f61e8ef5d9b79609b848f262c134b404fb46fdf9df08fe1ddbead. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTAW2365559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13aee949dffe6627cedf649598a66c07b9d657ef9866504c27728c71f569c2c4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTB22384185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69030acf629dce8c709df9f969f6f1c1b31912948bb3d59721f7cb866813e69. 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/QZTB62308017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d50812e9d61e78a16bde9bfbe8de62a05c29df438ac4e32bbd200b238a9f66d. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:22:43Z), 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/QZTBB2395929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9c1869e53714e55b0c1d77e6770a2f6b146564644da5517485f4c3b12e5620. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZTBD2366011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5325cbc67216500a7557a8baff4b629af1313657f41b39a6840c0a2f4159447a. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZWFH2391518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc36b9da6990e3f8fc965b4e1ff7492813e008f9f331f5d3d62a5eb6fc8a780c. 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/QZWFL2313489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26532fff8f9663a0410aa41808885d6374b8bbcd3c879716eb82c71d91688a2. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZFZ62489546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51716d93d2359448fdff89b33186bc5f4470a14c241fd183da197e952a42f6b5. 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/QZFZ72496112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11eedc2ed6fa01f472340363042dd08dfd44f6b430369b96f9ad684cb02bb92. 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/QZFZ72496447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efb26fc21b61246b95527620d4d86e297d035bf0230e982de147d8ee08b76a1. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZHN32471806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1fa674a4833d9dc30cc6f6b14708c7e621d7ff5819509a42a3bcad1dd0bfa78. 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/QZHN52415423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c8daa9e2aba30afcff6bc5f495a8a2e6232f600cf9c466d21aa6771bbf663f. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QZHN82428490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062550ec04d6a108448dc19219428c854b056a75c0995c6393564d9ca82b8e70. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHN82428492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4133752f39e4997ce8e67c7be0c2931340b9d6dfe1b5b34ff8d6ab0d975e3625. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZHN82428494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691e5f81279dc38261c6378e802eed8925edfe9bd8f85eb54cacc8b51453ec08. 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/QZK6N2433750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c42464f1a692eb300d3afc395eb9053ce0888a95973b60a324464e614e1c68b. 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/QZNWT2415642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeba7ebbfe84e293d207a7e8443e1da20e665f73baa3e2f82aaff449a7f0cc6e. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZNWV2400944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27e3a035c67c45d8d507cadc65bde514a9b9cf006ccaf882438e2077f13b75f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMER2561430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b80da3c87d88d9bcd39cb2d0e81360afc5b73b0de502a22ab0798ed4d030a55. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZDA52440728.