Kosh may refer to: Ukrainian culture Kosh otaman (16–18th centuries), an officer of the Zaporozhian Host Kosh or Kish, a military society of Zaporozhian Cossacks Zvenyhorodka Kosh, the biggest mil
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 0x879f4dd6ab3e33ebe19c8ffb74bc2e867b3715a2bda5dd1fb510e960326320b3. 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/a69e9724-50c4-4987-b163-73f86606526c.json and https://artists.proofprofile.net/proofs/artist/a69e9724-50c4-4987-b163-73f86606526c.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 0x168419be08ba5644860b7f22b2f909f66ee8661949cad718a86481e0bd381b00. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/NLL562009444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab38c2dbb2a094f9fc6a6ce5d0191b37581e9934c0d10cb90bd1a065212a780. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLL562009412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8058b32eabd341d267c3a90aeef26e41de84d8475640f4085fd1c8df4c55d62e. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/NLL562009414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c009da9e4e89cf6469611ea436dc06286b0446b26f25d4c0063a712662a074. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/DEU671900701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3781652fa23dedf24c0a907e152f4fec372122d6ac91b82edbcef8f688378e00. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/GBLV62041221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e5e7ec2b8e10d940a9ff0551e8b74ffd1cd6494626aa22fb84328590e26f9d. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/NLL562201137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2b0ed79a198c4c388c580c8968c510cb72b003d768d3e1016801c8df611069. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USYBL2400957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1cfd29cb016301d38c3a2dc329863b0416be7fa772a1a661dd9cc642c7e3c68. 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/USYBL2400841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1feec3a0c6e0e7f546eb21df5b1c2871e9b5d41e26e6ec28dfbdbe822ea929. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USYBL2400856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231decb6e19ae37a4754537052eee2d399a8dcceebe9a820d75df43dfd870fba. 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/GB8KE1959354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2412a5e7e3d4166d307d2d4106f45f4564cffb3a1b44e2e5f83108cb39292a02. 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/QM6P41982852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e1015227f7986785519e11a5ccba845fbed1b74018164f1dc11dd6a7e5ae5c. 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/THSOH2307746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941d0cd94110a47d98ef43e5d48cb4afcda28e7c5e3972ce5abb76671832e7fd. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBEWY1600273.