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 0xaadc9f8fc52e3befc9104bf41b8abcf1b8b89ea1791c6a76947e15c54b4d8238. 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/c6f91ff6-5443-4689-8ee1-3843d426df93.json and https://artists.proofprofile.net/proofs/artist/c6f91ff6-5443-4689-8ee1-3843d426df93.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 0x57dff3c6999924c00fdcfc769337531171deba1ee3b988cd04af19c6d2b252fb. 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/CZA210801050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c86f226609b32147419cf3f088550254bcaed5dec7d286d362401b309f8ea3. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/CZA210801052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdaf9f18615690edb47d22fdd075632076d690b0f831d5ef1543b9cc1e514e5e. 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/CZA210801000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65206952dc6f8f32b868147436a08f0cfb5d7c5f7a991fa34a8b3f22199366b0. 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/CZA210801053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b01b1dcc86d7b014b31757af57022d84b7996afa72500aa00d2020a25d827a. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CZA210801054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4872175ae929454226e3b97d68c3bb8ff4efd59fd3cc43998d7a821e3634db. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZA210801055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb80150f2264fc6e69517d73a023d6bb3e45926c2194305c866b77e48abf5cd0. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:30:52Z), 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/CZA210801057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36f9b561d32c9dd7049922ae9b31840d8a0ee1df39669a39c5a7138e7149201. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/CZH931300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf08018b856395583421df80faa17344286b4eabe37c366265425ec718ecdbda. 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/CZH931300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83edac8f5d8358ce181cd59460ed7ec0084b7bdf4fe9d08bab33e8425bdb9f9. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/CZH931300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c8217144ea0ace45d0f0262da09818a7afe6e52a0592630ae38e21cff6687e. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/CZH931300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98dcca63f1bb3987c05ed504a8d4537902e85fc2accd9c4a107f66ceb286dc04. 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/CZH931300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b0577ab5320d6cf7986ddede3e9ac2338eae7cb6b70423be8c73a5301a8813. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CZH931300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d7a6bb1c002e3d5e7e8ec3b9b16b78f0b996087c7720b2fc1609426f02bd8b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/CZH931300033.
Srdce jako kníže Rohan (50 mých nejmilejších písní)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda24aec65f2348889e6c612f9d529e1d0e9aba085bdca51925f59f8cbba5c149. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CZA110003025.