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 0x86142773af82d8e251b791bb1c038763b591e5bb7df1a3acb7f2cd7cf88cb26e. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d90c58c3-6793-4722-af03-c216c3300016.json and https://artists.proofprofile.net/proofs/artist/d90c58c3-6793-4722-af03-c216c3300016.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 0xdc7f938ac49986273d604bd56ea00d5506510c0c32e41a918a9129f2a914d427. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZMER2447837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05cc98a48da7cab34822bfb706520a073370450439b002c4c83a7b11407f27d4. 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/QZMER2457538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabecce71cbaf260a18bdbef9faddd57679118889bcae07c8be25b29e6d226c04. 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/QZMER2437633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba964661b361ce5240f1267b2fd0ff909e3a50d6a880d718bcc4b235f2df5ed. 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/QZNWQ2486171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48655d7d547f5e89bc3a13d76fc90c476e8232e7758a7702ca9221e5665d300b. 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/QZNWR2410599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd53674d6873285f4b0a1f0a1733e7b64c59b24b6505cb5bd9e416697020f2eb6. 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/QZMEP2425492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970f455d9e8f6d3774bba939dec26cb11a8c95494a6d81c767b1f3fc9ffefa76. 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/QZMER2450795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe059473c58d734f9e3b28497d2010f1e68802c4433c9880b81ebba819b45b61. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZMEN2461374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23707d9e6252d27b60fa0a9b647cd57d9fd41f2a33fa263e6e0a51f6da2b9027. 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/QZMEQ2476404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabed5f3d193d837582b83a8e6fd29ab4b79a2cc13e5cb840a252ff7a38fb047f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZMER2447025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453d5037068139de91f23664cb36b68ca6e88f71f0ce7bef5f7a79e524b8c52d. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZMEP2469064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57187efa1db36c6456f48781f2a56b70cb3ce1fae40178fb6a473ef356416b9f. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZMER2455350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67942297a2f92b2899a2c255f2fca18c6017087df3ae288cc017369be5206719. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZMEP2475205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437064212669f2ea1f8c938109b27437a9a2aaac7c2fd5a172f67474ed52ecf9. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZMEN2490950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a413f8e5dda122954777fd835810d8d58fb33f92150aef5ec98bf7fbad75a21. 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/QZMER2407635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993a9c40af21c1ad515b6eaaffaba391bc3478ea912e458422067c99dc6d99a8. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZTPX2454674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae2b1b4c23c2139de9521dec0f93a02435247cfd304460f23909db826091611. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZTPX2454676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0e3179621074c8773f39db496ff83ece669d1b080bb791dde0751def294716. 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/QZTPX2454682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aea88479aca886bc076ed305b327090856222586a2f14fb80e9473a21a77a9e. 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/QZTPX2454684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c77982d6489bc191ea9b331bfc67f2257c468539d5548421ce2a872cd4ee11. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZTPX2454686.