thumb|Edith Södergran, self-portrait. thumb|Edith Södergran, 5 years old. thumb|Edith Södergran childhood home at Raivola. thumb|Edith Södergran's memorial stone erected 1960 in Raivola. Edith Irene 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a785a5c3bfdec346dd193f2b4d57d18dd4d8d8f3d5d7bfb440eafd79469a3b8. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce318b3e-7ebc-404f-9921-a53ddff0905b.json and https://artists.proofprofile.net/proofs/artist/ce318b3e-7ebc-404f-9921-a53ddff0905b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dagen svalnar - Arr. By Robert Malmberg and Mats Bergström
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa36a6c56dcabf0c8ef22914b617ea4e1ef995b888d7b27523f3378d2b6fed537. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62138207.
Nordisk vår - Arr. By Robert Malmberg and Mats Bergström
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8208d42faf02fd5571ecfc1f69e26064480b33ed06cb010ad00ea51a75c58029. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62138208.