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 0x4f8ea3d17fdd1303b3ebba278604ca0955f08baab3925937a13f123327e1db80. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4053c6b1-1e29-455b-839a-6312ee994f1b.json and https://artists.proofprofile.net/proofs/artist/4053c6b1-1e29-455b-839a-6312ee994f1b.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 0x56cc4bf0dc63df20d15a3b14b18cf2aea48f09b6953ca1ceb990e5f1f496e684. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ES64E2484228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d97c67c19e892850067b559850ca434aa375f30807ef922ad045a28361095c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ES64E2306091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94541096f33e7a285db526ffe7cf2a613f28b40b64be824aeade2ccb62a4631f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ES64E2484238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213e0dc45b632d48fe069c54273cc897a3b830beda9c660d416fdaf2ca98602f. 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/ES64E2484239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9014253e5f478bcc8632e50abc6e806757afbae31dedbfee7fd0f5953cdcf201. 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/ES64E2484240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1cfaea54f82d610abc126ed1266f480b9325437f5663a8bbd5960bdc1aed40. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ES64E2484241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd22cf82cf68e7081fea89260c0a6168e278c25ec90ab932b2387f224c445cd. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/ES64E2484242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62550cc3fc9a08704c4c12c11ca8efcaab10eebf64e5dd8c9c49aeec00919ee. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES64E2470427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d97c67c19e892850067b559850ca434aa375f30807ef922ad045a28361095c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES64E2306091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadde9eea197c924e04f28d93264a9c7005c6be0f14fd9672288a7e1c11091eda. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/ES64E2206146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5bb8c772c46f81284a89cbb8ed31e740650c697fda24812b818c5da0654ec5a. 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/QMBZ92003129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37fa742885bc923ce4c16d4a6c9911cd06eae69a43ab5bf7c2a3c674041d9e72. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/ATRG72006401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acc9d6a8a173fe2f1ac95bbb1c69fed326c0b939e1684f6ec7c829830d635b8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ATRG72006403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd900c95abe7f06aaaf2b0a149f277082251982c2e468c83e3c413d2029f6d12d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ATRG72006404.
Cuartos de Final (Gazir VS. Blon) (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8025cf2a01b37698ef2cf65dfe84286788d9d48666e38f0fd9b91cbd4afc3f5. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/ATRG72006406.
Cuartos de Final (Skone VS. Sweet Pain) (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7aecfe114a512a09aa69def0b40fd4eb5248c4c679c657dddddfdbbe0848aa6. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/ATRG72006408.
Octavos de Final (White CIX VS. Gazir) (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4fb4a9de971042080a925d6981cad40b54f397bf6772abda9d97ddcda6803aa. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ATRG72006410.
Octavos de Final (Jesus LC VS. Sweet Pain) (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b19f84a4a870d6234ef0fc673ef74ce94743ca0487a52f42409357a503d0b8. 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/ATRG72006414.