Activ may refer to: Activ (ship), SS Revoljucija 1909 Activ (band) Activ (car), 1.5L model of the Chevrolet Spin Activ (company which supplies automotive components including ADAS) See also Activ S
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 0xd9f08c0a0d99915d39f0653f31ca8fe51dae0dfe4b034d52caef2f93cec0b6d5. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe0a79ed-9b52-4cab-bd4a-a52db0a7092c.json and https://artists.proofprofile.net/proofs/artist/fe0a79ed-9b52-4cab-bd4a-a52db0a7092c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).