"Dancing Queen" is a song by the Swedish group ABBA, released as the lead single from their fourth studio album, Arrival (1976). It was written by Benny Andersson, Björn Ulvaeus and Stig Anderson. And
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 0xfb562aa07f4e852f3461af942f0ea8116d7ad695679e07c0b88d6772f04596e5. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db64bb53-0809-48ed-adaf-91605b42266a.json and https://artists.proofprofile.net/proofs/artist/db64bb53-0809-48ed-adaf-91605b42266a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).