Tarkio may refer to: Tarkio River, a river that runs through Iowa and Missouri Tarkio Township, Page County, Iowa Tarkio City, an extinct hamlet in southern Tarkio Township Tarkio Township, Atchison
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 0x0bfa6ee05c12df5558d3a09336c36d1d8946097cc541e71bd42399fb07d77e10. 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/26232bc8-068c-40d7-9d77-71a1b0f61e1b.json and https://artists.proofprofile.net/proofs/artist/26232bc8-068c-40d7-9d77-71a1b0f61e1b.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 0xadbb043d90c0e893a77c2b78eda4b1c6f5fb8363d14a001b1fbee09b4d36c368. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/USKRS0643514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521347c877d7e23ebc4fe64b04088501477dff0086dbc66e0636d6d6d8536085. 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/USKRS0643502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bd505defc2f47523c9ca3fa83140e2c33186dea90ad721747d85094bad37fa. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/USKRS0643516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8e9719d32828bc53a486d994c2ccd8ccdcd5e8ae6f66f2e9cb333c75d474b8. 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/USKRS0643506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323932d1202412afed77b20ebc35574f38f14be518d1057b84c0c53014d94e2f. 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/USKRS0643507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37cff3ca99f35f54500549444088b23f6a72225ce984629dddff8e2221426fb9. 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/USKRS0643521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2457377fdc7481588f8d48cfd80184e23e0a4ee8062635b6962bd4e1df9641d. 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/USKRS0643510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e18d2adad1cc4cc7d4ee62dc8d6e28245ff56f75ab7b75e1ca40f5e8486be36. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USKRS0643511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3efa3dbcde01d7c33aaf610f02753defbe548d33140d7f8748498048a963e2. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USKRS0643513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3c76e1484c4c59f6a514c4357b5489c56c0aebae6ddc6d0854901f258cbe72. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USKRS0643526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816c5c4066e61cb1447400c907083e86c9fe4ded3843fc9cc2aedfc2b3d65552. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USKRS0643527.