Mark Springer is a British pianist and composer. Springer first came to public attention in the group Rip Rig + Panic. This group also featured the singer Neneh Cherry, Sean Oliver, Gareth Sager, 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3394200d3e651045835e32f779893fc1249f0392b651fbdcab29912e5829ab8a. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a231f833-7769-46ef-941f-1ce938709cc5.json and https://artists.proofprofile.net/proofs/artist/a231f833-7769-46ef-941f-1ce938709cc5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
E.T.A. N.Y.C.: Jazz Standards and Original Compositions
Nature, Music, Food, The Stars and the Planets
Weekend (featuring Music from the Film by Barnaby Southcombe)
Metonic: Music for Solo Piano & Piano Quartet
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 0x7213d2501f9b4d22c5aa842e3b7d427653a997f98646f94de7d7268b76ff7e6a. Chain 2 (Bitcoin): anchored in block 958554 (2026-07-18T13:17:01Z), 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/BEA692300152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc941ab7e2a3ac435dd2a0fada8e726cb7896b845c6e88c507cc38b4aadbbfb. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:37:57Z), 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/BEA692300153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf1009ef06c0785324b68121e4255ece40bef38d6eef82a08837527a100211b. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/BEA692300156.