Mark Cahill (born March 16, 1962) is an American author, speaker, and evangelist. He is the founder of Mark Cahill Ministries and is the author of seven books. One Thing You Can’t Do in Heaven has ove
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 0x71aa1bf8c1632b18117f5d4020bdf39beb8edd484f708b621e91f8559920ef64. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8c237d26-4e91-4f75-b941-2bb385afc764.json and https://artists.proofprofile.net/proofs/artist/8c237d26-4e91-4f75-b941-2bb385afc764.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The City of Prague Philharmonic Orchestra
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 0x47fa4acf85af4a9aa8751b989e9b4c1c1fea8586e52f35d20cccfa2ea256b0c3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US7851900230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997b0745bf2eed8c968aedc2e1419476e1123394307da56da834198668ac28df. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/US7851900226.
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 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
There Is a Place (arr. M. Cahill for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2928fa91210583307d1f95ab9d62bf45e6274f730f974d50c9b1699c76ebfa50. Chain 2 (Bitcoin): anchored in block 957056 (2026-07-07T15:15:30Z), 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/IEBV01400008.
I Will Be the Vine (arr. M. Cahill for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2437326bc2696218743ccea5ff1e91b913796b25ce7cd47587637424b7f87a2f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/IEBV01400001.
Far Beyond (arr. M. Cahill for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9f0d1dcfcfaac686d4d8b81d9ca6c65fd13529d9a78aedf7151d0fb19be830. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/IEBV01400002.
In the Quiet (arr. M. Cahill for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a17e192f594e2e0f101a6885213d330aa643ec1f40acb8e111d6745662b019. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/IEBV01400004.
The Silence and the Sorrow (arr. M. Cahill for orchestra): Pieta, "The Silence and the Sorrow" (arr. M. Cahill for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcdcca2f0c564d1b196a2ee02a7e07b2d6bd651d8822daf4bab167997a4a88f1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/IEBV01400007.
The Voice of an Angel (arr. M. Cahill for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b722eb3aadea6307fc7a4c60916ccaf40ace1a82646d5e8c7da2406dcd8b31e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/IEBV01400009.