Ans. Andur is an Estonian indie rock band formed in 2002 in the city of Paide. History Madis Aesma and Gert Pajuväli had been partners in Kirssidega Paide Kultuurimaja with Rooza Öökull and PillSkil
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 0x080096380300333ff14915a60ae6d4fa337c6b953c845228e92e3c235c14d0da. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d1924d8-90f4-480b-abeb-691a9ed39144.json and https://artists.proofprofile.net/proofs/artist/6d1924d8-90f4-480b-abeb-691a9ed39144.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 0x25c52888bfa524439ed251079a058331b94545b3421b82b1eb035869be5a59d6. 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/EEFC10152303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb04917ec1818b451ac4a8f2415c07dee1aad40a8ace8e5794a74d2b6c6e3745. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/EEFC10152305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6125f2e97284ee267eb18ac3130dadc241092bd51f30e3dfe6ba0a0a9c7a9509. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/EECM32100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652a05e0cc937a2682bfa1ff88930bda3a3dd4590c33c54d5ae347dc80a59a14. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZES52268673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6909617c31eb8aee820acef8a6095b3aa830d5a0181f376aac3594a33a0c85d. 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/QZES52268675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9c8c19b662ab467cede3ceeb17d3d379a833cad71434571ebf554ad5b4bff9. 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/QZES52268676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86fdc54e7e2d21978dbefee6483c72f19e49215c3d7c32eed747ec6330cd3ca. 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/QZES52268677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16e2503c8d3499934bb19c2f61bb6512f677c18b0189427f06d927947ba4c9e5. 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/QZES52268680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fae2dbec74c8fc05bfa1b3f925d9aa335c6e01e8dcc37f05b7a2f1923e3c551. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZES52268682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070e7454490e8b0c0ba03afe907b8acb9edada28e0765a7673666531b405587b. 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/QZES52268683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3586976f248175ee46340b8536286f0b5db3c4fca5fad65d5733b967b7e63427. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZES52268684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c9b26af97c029996d5d19195b086143ca5aef51deb8907176c82605c45b3edb. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZES52268686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0b01ab71760a0f4370ce749f9ac3e673cf3d86c201976ab0f6561d2cb5559b. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZTB72501450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb269b22e5af979463bb1e4bdeb8745683740f1291174a66b899c61c5511f1e9e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/TCAFY2108886.