Siska or Šiška may refer to: Places Šiška, a city quarter of Ljubliana Siska, British Columbia, an unincorporated community and First Nations reserve in the Fraser Canyon of British Columbia, Canada
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 0x3c27879e9fc2f8863a17fca100964bc4eaa7288d6554a7f9d5c63fb1e557e2f7. Chain 2 (Bitcoin): anchored in block 954032 (2026-06-17T01:59:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3baac5dc-8326-4d52-afbe-b2d72a69199e.json and https://artists.proofprofile.net/proofs/artist/3baac5dc-8326-4d52-afbe-b2d72a69199e.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 0xb1bfb9f772d88cde967e424a44e1b268c7e2e2e1afa9d90456250d987c625e7c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR6P81500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1b9f30458dbbab2934a6e8d8f753bbd950e71a8541206780c5809ab17db62e. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/FR6P81600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1bfb9f772d88cde967e424a44e1b268c7e2e2e1afa9d90456250d987c625e7c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR6P81500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b746b768c259609434904982e13067ab30c90f3339e05d352a5b5546d54d5eb. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/FR6P82400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e34cf7a883b7377fda521e0528e370261bc32c90ecfc7deee7c335f13107cd1. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/FR6P82500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed54574340c42a9280d8abdf4f3ee1b9fe4d801a0572a522529f51e0e11199a1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR6P82500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1deeb4c62a834bea28abffcadbb3d143fc59121d41887a3bc4456ea67f85e082. 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/FR6P82500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf76604a3ab95e5b0d0a4d159c3482592d8336b3c3770a6c1bb10cef422f82979. 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/FR6P82500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37b86f1c6ea975adbb9d9cd9ad4df8aa149981867a1f8b00641095f01558a1b. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/FR6P82500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb693a99439f1d258985df5c3a4f7bd3e31d3fd886e5b073f228c7c5f76e1a14a. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/FR6P82500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e74fd93bc27bb65b36bb48265468fa6258cdf664abe39b5bd9fa837bf09b21b. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/FR6P82500016.