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 0xbbcf22ee7e18d56e789955a85088adf96cfdfbac5483b20ad270554feb8431c1. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0e52051-ac75-4b41-b2d6-7c74d7e4100f.json and https://artists.proofprofile.net/proofs/artist/d0e52051-ac75-4b41-b2d6-7c74d7e4100f.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 0x97bd432abe4b17f1cca17b16f1c17769fe52a43009f8290538390643f4c6eae1. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/TCABY1431027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90b6f97f0d45089f02a2185edb5a57e613417f81ae7516470497a889d062757. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TCABY1431028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b87327ee3dfb500567a459d53b042f3c7a655e0a9cab8d24178f7b4ebdc087. 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/TCABY1431029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0ce474b8f6001885a5466e32740fee06caf41d2e2ede764e16e6dcb2e7304b. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/TCABY1431030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb45994bfe56b914dc0b5b12ba60f0dda5bf400f8dac390d43fee29c2c62e4e. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/TCABY1431032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d2ff9f99b21be4a48bdabaa430dfb6f47dd5fcc043a96add38cf689099d0d6. 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/TCABY1431034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x909078be4b7b0226bb7f005df1cdb5c3cc88abc13f485823a88a4b6abf4e1a4d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCABY1431036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8483759b76496087170a9769053bc9441fc4934f89cca646a9c0e4fd505d53f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCABY1431037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc98e9fd24535fd8734cb017c4a8bcfe1252273ce7a0c79f6f33477cf687ae7. 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/TCABY1431038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba86424837630366a1ca0c8490d87ef4804f2ae73274d69c033ab7cd44959127. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TCABY1431039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a54ecf4089669c5dff7a098ceffc37f563d48b894683ac8063a52eb439ff7a. 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/TCABY1431040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c8545d7e74a6e527c5c7f2a956ef233a6ff1d6f03a204cadf94ec8085360ac. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCABY1431041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b489df1de79741c79b478e26ae30ab4ac5333a94b7648a8b9204a0bab6e5b5. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/TCABY1431045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f388e6343c2a591e5e9719a432e7328c4bb02668ae33a27db68df6f145989b0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/AUXJ21000056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e9c5c81b43fed88d1baadbe74e85ff9a72e066e48877729921334e40e8240f. 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/AUXJ21000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c02814a2b1d30484026e14db8611b6795ec6cf71765e298bad1eda1bd2b1560. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/AUXJ20900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad0aa0c7b7b8c50624455cd3fed0f6ce73276358e0176adb2bf8ff1d3e67c04. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/AUXJ20900043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6c533a6a2ae1a2d2354893b954565d4e96e2a225938e883a8b800d3b6f1cbc. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/AUXJ20900048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee91610b28473abc77f424618051a8cfd70c19e43891f23b451b2eae07c2ac89. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCABU1454203.