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
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
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 0xd9bcc85ad20f62bb6a4fd7719794f172402db2784434917f6051bf116593bc82. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USSM19932391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3124f96a0a4be5356bc635e7f7bfdfe40929e3fde1eab8d6b3f1a1430914f7ca. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USSM19701408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee03573e1f388ddf034cfe6fe6c17f552c1c9a38d5d6c69cc1214adbe1439e9c. 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/USSM19701416.
Surrender the Sword (for Violin and Strings)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb1c61dc7412e893db27319cfbd4bc9b24edc2871a01fbee8bca49c7ed7684a. 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/USSM19701409.
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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d8bd327f36b3fd15819aa2c4024b7fd4e24a5512372a051d290d522ff1326c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USSM19701532.
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 956639 (2026-07-04T11:19:20Z), 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/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 958876 (2026-07-20T12:15:48Z), 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 956857 (2026-07-06T01:26:17Z), 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 958444 (2026-07-17T19:12:23Z), 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 956312 (2026-07-02T05:09:12Z), 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.
Transatlantic Sessions - Series 1: Volume Two
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb131227c04e1b9598bb7d0233c2aed86133e2d15414d63c2eda5fd61f2f651d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBQSK0901614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3409b967e6b87ee8038cf90074303d374434b0d906ed90239d85b580fb3f653b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 0x1078d612955beb5cddacea7363252f11cf23e842b12a1bc573d7747e97d7b692. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USSM19932390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90d5f7bb98cea947ae3f62d831e06ad5e3b686aceca28ae0352d4f33b7a5f70. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USSM19932393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a81dc9290adce3c8977ad1f5a492c191ab146c57c0be7d5ad7ee3e09daecf72. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USSM19932395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40170ed66519cde4df1d56e9f79be79be25dab61858c66086bd62db27c614a7f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USSM19932396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a111257fe17d1a24ffa8db9847f07860fe39a9c0e8e34a1b9621dd33b6c9fe. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USSM19932398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09116f6ee7052513eb64b00ea4778c38e0f9fa1311d7c1bb757de664f14cfee. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USSM19932399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d685aff432dc000cd2f5262ba0d0202a0218d116f0d8728fef8008610365b5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USSM19932400.
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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3a947d64ab08ecc9ac56fd100227004fb2e498ae4b208b056b276e2f1980cb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USSM19932404.
Appalachia Waltz (Version for Cello) - Solo Cello Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317dc7d9133651ca2794b3094d276fb4dc637c8ba76b7be3084ac1daf22dae16. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USSM19902729.
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.