Mark O'Connor (born August 5, 1961) is an American fiddle player, composer, guitarist, and mandolinist whose music combines bluegrass, country, jazz and classical. A three-time Grammy Award winner, he
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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408f1dc3c1a63b461277bc668929fd37b3b302524284d507b4e0d77fd256a3d0. 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/cf0fa077-8673-46ad-aa42-d6ac849b1148.json and https://artists.proofprofile.net/proofs/artist/cf0fa077-8673-46ad-aa42-d6ac849b1148.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d623c8ef3d33640ac19d58433360f8a09939cafceb9b6b75a31fbf06209501. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:46:26Z), 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/USWB10102017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7973c4196db71e4198c1d3aef45c8d4e17b2e7886360aa3bb83da40cafc103ae. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USWB10102019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5400b0333381d84b95396b6bdbd13a9d4147042798f68121054da6983001746f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USSM19701414.
Americana Symphony (Variations On Appalachia Waltz)
Mark O'Connor: String Quartets No.'s 2 & 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9763079bbd03608ccfc7ec7f23b09e77937ffcd419d0e6def1ade5e3a0bfe08a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM6MZ1539520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156a2dae535d04e92986f1756aab00988b67d04316d5ba7751783e81a1c365a3. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QMBZ91927490.
Stone from Which the Arch Was Made (Remastered 2022)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c9847674961064dda48830ec68a0eae361b8f2aa098a30785cc058de556f15. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QMDA62284027.
Verbovaya Doschechka (A Ukrainian Folk Song)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61334d263a9dbd31b3d56f632b6607424eea54cc6e5382b3d9afd24638dfa285. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZ5AB2440299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb5eae3249d3d72f607e427eb6686f354a648b2c8c60b2ca4b5f8eaeee48731. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZW9M2367090.
The Cherry Tree Carol (An Appalachian Christmas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3867c0a89dd71356fe82e30c9e6ca01f055e21af69e336c423662907929f690a. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QMEU32503105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7305e960411d807c8714f583fc582d97f47e20087021a18ff66c32cbfd528c. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QMEU32509358.
Jesu, Joy of Man's Desiring / F.C.'s Jig
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5095ff1c85d930288db3b49091a22a936856483d1e10f0f49c66c0d8b6eba8. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QMEU32511219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5980cc6f22f74fb1e04ae72c081ee0a901dc03ee6b62cb714158174a9cf0e819. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USWB10102010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3409b967e6b87ee8038cf90074303d374434b0d906ed90239d85b580fb3f653b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USSM19600842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8baf16815909297895306d69155cbb5954b20757158015eb1b0567b80e0d32. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:04:30Z), 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/USSM19932402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b5ecd68c7b0db4f718c4c7613968eba965952f2ac3f6a9e9bdca3705c7b214. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USSM19932403.