thumb|Kosmikud performing in 2012 Kosmikud are an Estonian alternative rock group founded in 1999. They released their first album Ei roosid in 2000, after their singer Taavi Pedriks died. The remaini
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a79ceccf36a866d46229e351cf274ee446e4aa692624b1aaff10f0fef52cf1e. 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/d8d8f2ab-155e-44b3-8859-f64bdc6e4106.json and https://artists.proofprofile.net/proofs/artist/d8d8f2ab-155e-44b3-8859-f64bdc6e4106.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a711e70815d91b086d45b06c52f67d07ee3bcb758861d90b2df0821bd4260e4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAFE2021951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a6698f67779d29dcd0929f778f853f71f51b4effdae7d31b8cc8790608443f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAFI2013880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9240209d472319fa1dc42646b0b1e1c2dfe40ec439531191a3b7ec1176597071. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T14:04:34Z), 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/TCAFI2013882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd792751b518d600c771d3e912861d7b0baf183591ead0f3264f5346087f3add1. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/EEAF32000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b037e6b004e91663bd0caf1bebe8c526d8286035e101d27cfa40245bbbfe8c0. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCABM1364754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c3e020f2945635ac1041e358f4f52306d3096108676a09731d1ba62dce92b0. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/TCABM1364757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac18735aeab85766a093e24e8f599d8b6aad7641b8ce2824f5df33beee01e2f. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/TCABM1364764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5de60d4de3994041542347a806aec57dd2f950de75efb8091800157a097378. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/EEAF31700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834e87f5a72746bbbc87b8ba16e10d4501b0431dc98c34aedc59560c21476749. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/EEAF32000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1b1e2c76e95c0941668c5b32755240d85945b560e1ee5663092c35a48989e5. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:54:20Z), 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/EEAF32000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a9992ceac0b4ea28fa298f76bf2740956535be32bde615ad12a6e187b9dd9c. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/EEAF32000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1207c6341e7b56f42b1b2810d93c9b48720eb39d75d143b1d93fea1624e3c88. 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/EEAF32400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9a52da7bd5fc89f17fe550493a892067264512a960bf91603547d3cfe88f67. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/EEAF32400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88752d7cae77f003a1a9ce34da1df25df48cac8ae52dc8c9aef8a18606e8ac6c. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T02:20:47Z), 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/EEAF32400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa336d8f986f7c908baae3313112dcefce5ce1ade5ad5d43c45e21f71deb61c0d. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/EEAF32400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x580d395c1a624be0bbc71e3cb062263861390299c7c78852addc36c81f05e86b. Chain 2 (Bitcoin): anchored in block 957634 (2026-07-12T00:26:43Z), 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/EEAF32400014.