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 0x6faf82b78f76d5dced98e92b68fb46e8e537bba4b953d5308aa22656edeaf9f5. 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/9b86b506-8833-4e7c-916a-63345b57c391.json and https://artists.proofprofile.net/proofs/artist/9b86b506-8833-4e7c-916a-63345b57c391.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 0x151132445e7ab10e08be0cc43a79127f8d69319bbe57b7b0af08f4584a39317d. 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/QZDA61904051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888fb56a3551387ae08f2f33d719908adc9eee8ee4e5a6a0702ecb1acc5ed412. 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/QZDA61904052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb7a01b36061dc406572ce8efde102171ac8e10ccac7cb4dd17896c7b4040ce. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/QZDA61999216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208f91d3d7a01154aa5159b45feecd55ea8a505b14c2317f09e636e87af441a2. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZDA61999214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660ba8ea03df344e25e40fdac8aee1f9351cf3df58d25fe5516afdb7a63f60f8. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZDA61999212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee68d2004f2c56a0a7a42a6f18fbba4070ba9eb3c58b222b58e0f55cc47707af. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/QZHN61939234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6f5aab30473c5ee1b071210291d3304f59d15674d6a69d4d6b69cef073b0c6. 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/QZFZ52078893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ef06d9047bf0fe5e6f1c9ab84154228857084b4e7e4e8221b04247c66238fa. 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/QZFYY2081288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167fc493f1d31ecf24ad8faacb29e921ea4e3bbc78968308a57cdb3fefbda8f1. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZFYY2081289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0b360041c41f1fa2521c5e257d5d8b9c8f5b75fdd3d2d4fa8e29948f2b62c4. 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/QZDA82177875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68060cb2f2e19599495709e821a3715f2ea0249aa5f0da915c22ce5a22a23f77. 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/QZMER2112292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0a5dd96be8ea98003f1bccb78c2dca75ff33b1d6b14e7d3d0e293ecaceb477. 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/QZRP52169501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf744a1eb2323012515075e9d1aede1a087d46b1eb2448db74e3db8cf804f2bb0. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/FR10S2371498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36287570ef6fd5b2a80a40d88cc34b25d4536aa9eacd88ebc977551f11335dd. 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/DGA0Q2408319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87909fa491f2d15b0525c166c3b507f9dd60e20b7df49fa18f21b4bdccf330d. 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/DGA0R2481007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x848cf8a4d0ee3034c9cc69d12881c33a842a304d45b9977ad8d4d6dd9da497ef. 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/FR96X2582600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3a9a8ec90ae74359a6df36391e5bc11addd9c877a03398f2c88bd9934e8b03. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/FR96X2582601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb87e17d7b71945913b57853bfac4351de44bb631a039d6abb70c7def82963c9. 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/FR96X2582602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d242426eb94f6f4233412f869f79a7454a28ae3413523f8d0106dd5cae1609. 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/FR96X2582603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48612f255b4af2bd4767b193bc43b706f4ac7f2d9b6149b6f4f6f8bb72b87f93. 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/FR96X2582604.