Mark Eitzel (born January 30, 1959) is an American musician, best known as a songwriter and lead singer of the San Francisco band American Music Club.- - Biography Eitzel spent his formative years i
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 0x21f73a7220778262ca3dfd7e2f74aa519714956e242ed9a17892ff9da0484b83. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/55eb7085-bdce-4403-8aea-79623b443cc0.json and https://artists.proofprofile.net/proofs/artist/55eb7085-bdce-4403-8aea-79623b443cc0.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 0xd62271a37af23af3dc8f393e0429f5a67ed7338a0a91e5f6990162e5b430a365. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/GBAAA9600515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce5b6a7093b5e82d8bd26394f4a8b9845f99088655e3c56538fab1f84f6b02f. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/GBLMS1200177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb60478c714f21626e5944e3f8aa4be3cb85df36d3d1fadf2b263bc462a3f403. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T09:54:18Z), 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/GBLMS1200179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe24da3d9c036f832f64713060e99ad4626cd2249171bbd9b6906be88d1d2404b. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:45:35Z), 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/GBLMS1200182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce538b291591427fabbb8256b468a6dcc67669936ecc3af48bf3fa95012122a1. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/USMRG1246206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f0601e8c386591493aecae243718b99704a8f1ff363edb38ca378ccc526ee8. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/USMRG1658201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe8e0858ed9b996f116dbb148f468972d4dd52b61529f50cfcf222eb0e1b36e. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USMRG1658202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9e2fc24308591309961d333944db840942ec2eda12853450e838c5c484896d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USMRG1658204.