Holger may refer to: People Holger (given name), includes name origin, plus people with the name Hilde Holger, stage name of dancer, choreographer and dance teacher Hilde Boman-Behram (née Hilde So
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 0xb113a927af3bcb9daeec7b01f031861527b3f4cb22d7bb7f859f79909830ff7c. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e2d73686-994a-4460-a0c5-19674bbc1acc.json and https://artists.proofprofile.net/proofs/artist/e2d73686-994a-4460-a0c5-19674bbc1acc.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf2d9e34ea8372a1c5762095b603adcbfeac5e9e85399ba91a0fb3ec8ac0434. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T07:35:53Z), 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/BR4T11200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf3f31bc4c681f83813b70348961839c8ebf03c16bcf2f79057d5b28223de47. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T08:06:13Z), 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/BXPE41400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75a485f02ef486cd93ac5ab69437ee2b28778b7850b805c7f5dd8ec7297ef1d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/BR2ZB2200007.