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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 0x74adc362b7b4cd1e54040de9c4f628dc55397cd1c62e89f9cbc13d8aeebe5b6c. 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/a53ffab7-7dc2-4989-994f-3ee445082375.json and https://artists.proofprofile.net/proofs/artist/a53ffab7-7dc2-4989-994f-3ee445082375.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 0x9beed0bb9eaa8806d8bc7d738f3c16bdcc72174181c6682a1b99587700fc68a2. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/SE5VF1900080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48bbe6a4ef1870c6d357ea448c70fb0e190c6222993bd1ba25f59fec96a31da. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZ93L1957177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02c3af13b1ad489bb6f56e70eccd2da1ec0ebec5ee39536a49f54d2f8a730e3. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZ93L1957179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d6dd4ae6856ef21f6f45b933edb528c2ea658ec8fbbdf282aba26efc0b87ed. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZGLM2070274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b06b70119df49b8a97a3496f5b0f49cf5e0e25ff70ca2b1c728d69736b9da1. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZMZ92102177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e851694a879e36f3e4aa144cb05061e46598a7cede7c8137ece257805892039. 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/QZNJV2171078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ad1b87317e808a8678aa96dacbe21cf9dab1d8b59ff506746e2a29f90fd65c8. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZNJY2156121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a66b6318385088c710f148e5a9064bb9d093230aef19fbe45fc78b2a5b6149. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZNJY2156120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa6b8f8badb3e7b7b4ef953519d3544a7f978f3df70f505fb512e66bb3b8570. 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/QZNJY2156119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6572faa88f271b0d2cff2d711bd1e4b86ec9c9ab03a9774f81ee32d482ab675d. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZNJZ2112238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b06b70119df49b8a97a3496f5b0f49cf5e0e25ff70ca2b1c728d69736b9da1. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZMZ92102177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae92c729225a991d3a836aa46b49a0937f6aac95d9b844fd640620b62e7ac32b. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZNJY2156122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e37e20d526fcf3cf1eec1bb0dbd3d5945e74a8e08074292dd2dab3908ac9115. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZNJX2274741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe258540acbe36491cf93660acf358ee1b334faddf9f787cf0c390c42952ad1. 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/QZVEM2359928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe960f7164856369fe937685ffc185f623584de95c6a7a5c2a0067768b7207500. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZVEM2383593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ee0afab43ad1e67ae475e9180a665a18ce77a93c1466e24eb9250b4903fb6d. 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/QZVEM2368843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed4f964bc85ee5716db1f89098a7beeadfeda2f42319ba52a1e45af888449e8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT2VB2415650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30381c23d78ecc48689b8600ec56b0de5b866a646ef947679eab0d64a4cf000. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QT2VB2406557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a582799f723ffd94f8f9403e3796b2f7b3b81ef49deccdb7ef7dd09561a0ed. Chain 2 (Bitcoin): anchored in block 957550 (2026-07-11T09:54:43Z), 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/QZPEW2518150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe258540acbe36491cf93660acf358ee1b334faddf9f787cf0c390c42952ad1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZVEM2359928.