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 0xc02b45e80400fec8397fdae025dd42a46056948b1fdb2662b4e5814d9ca38682. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/551d8d1b-0b58-4357-9b81-04dffa8f41b0.json and https://artists.proofprofile.net/proofs/artist/551d8d1b-0b58-4357-9b81-04dffa8f41b0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Muzyka Wieczorem Wiersze Jarosława Iwaszkiewicza Śpiewa Mirosław Czyżykiewicz
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 0xd5f05c333792aa07dd7e23783ed4e8ba85612b195afad77165ff50a3bb173679. 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/PLB171800326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd096aac8882902a86eee7b4ae9a8e648831f2057c2ba71400a8ff55997b3b876. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLB171302706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2fa80dd3866552925f5859dbe99844f7b641337c5476960275ce0261bd648c1. 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/PLB171302723.
Roman Kołakowski Zaśpiewany (Dobre Piosenki)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc50b1627bba085a240f8d86a46cfdc1bfc9eae335aed8e399cb2c7cb10e22e. 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/PLB171600563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7976d63cfe64f1d552839e440d1b7c06cb1efd42635de37ba56c7289e4e5b55. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PLB171600248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9adb81299d9e8acfc7ac96bf9fe62978567964e077d4d0e00440d36fc3d52d4f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PLB171600251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fb80a744213962ae87741378e9dbde92a87e69978fa0bb409e7fb49c45e5a0. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLB171600253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727af4484cf1388ab94f4c286e84996169333d063971cc442dce72fc49320090. 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/PLB171600262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65428247474d8dba2b4017393293fe7bb21bd295a0da400a689b477c3a027aa3. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/PLB171600264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb2333226bda4da8ec62133d9697ae048c64f2aff05e275271a3f45e7ba42f5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLB171101144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb2333226bda4da8ec62133d9697ae048c64f2aff05e275271a3f45e7ba42f5. 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/PLB171101144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaadf0f4718e268020c6ccd7813ad9bfdb561eb9b686b09b566fc1f2f08482d6. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/PLB170802002.
Dziekuje za swiat - Piosenki Agnieszki Osieckiej
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe486eb56b367d583d2ad7fe2d38307a5028c5afa0762ccafe5879ec8e86c3c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/PLA800994106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93efaed8882c79c6c4544f6bc3676a9b9c5bd47085d708f7ee96e9d81e2ff2c. 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/PLB171100936.