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 0x8157a6b60bae55c08475c368596a9445c21e56144f1d6bca9795c9742efcc2f0. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/78b1cc6a-3ad5-4e71-912e-1d274ce72a1a.json and https://artists.proofprofile.net/proofs/artist/78b1cc6a-3ad5-4e71-912e-1d274ce72a1a.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 0x272ccba2814d1d5cd906b175f75aa8af17b07ed1db0ac271e014dc7faf931a6a. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNMY2367366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f3e6e31e53d340382e2a6bac4ebf7c71dc8e268f2b3a6614c4085728aaee62. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZNMY2367370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9dc5dcc2d12df379eecb29c3eb28fc2fc36e7aa8a57bb7711334df001a509f. 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/QZNMY2367371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e77fbabc94a964787e423abef2d40fb948ed5e45e146ab9ddba6a17b1c3cbf4. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/QZMEV2411004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abb8fd6e204560d440c16bddf908cea6b4d6b19faf8f42b5eb068e6beb71185. 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/QZMEV2411006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c25608befc09df3409638ae89bfcc56653bb5ca75b62b9d33ed71e207b14c0. 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/QZNMV2440533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57a585139a39d5f60a7de8d6888b7b0e9569c9f2ea7fb9cfb64274fef8bf4fa. 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/QZNMY2491520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be4ee32a0ad35f3de66ba98aa75a450615460e4947745132bfcbf7a94df58b3. 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/QZNMY2491522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2985267957b7f94fb65b3251bcf885733c92d0b02e1391ac262b4e8b08c63b2f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZL382517083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa099d1bdcc2571cb282ab1606d252a7d288fe976bba7e691e52ff7f4f9ed76c5. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZLL92569327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e608a36c21fea67fe2909d0f1264d4ef08d2893086eaa032dbced20d63ff569. 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/QZLL92569328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720354d47d904c9cd9b8b413acb6df02a5690062faaaab1abb43da05b2fc4b47. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZLL92569329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5605d36fec7ef25dd4fb6ad388d40f3a3e14f4ddd13f1606e8d9280d60f37f5f. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZLL92569330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5cb21160da64ade5646c6808e4cbd068ea0bef8349d0834a3612da443e4800. 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/QZMEV2597944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1950db9cabb2ed9306c59b78e3cb6d6593a5c6e32e2b99de1d83dbd6bca4c6a. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZNMT2502020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c504c337e676069f8f81f7414d6620f9d036e806486e449f8b3238241ac0a4e. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZNMT2502024.