David Zabriskie (born January 12, 1979) is a retired professional road bicycle racer from the United States, who competed as a professional between 1999 and 2013. His main strength is individual time
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 0xa16e969df646861a9d410077341461a193ccdc276520ebb755affda31b1c0fce. 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/8082ef10-2194-4e13-bece-ed9ec8dbc62c.json and https://artists.proofprofile.net/proofs/artist/8082ef10-2194-4e13-bece-ed9ec8dbc62c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Pilgrim Song (Arr. R. Murphy for Choir & 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 0x15da51d42479f976b20c698fd375c5980df80f9e2cf5ad39cad496e0714670d0. 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/USRUF1010381.
Lead, Kindly Light (Arr. M. Wilberg for Choir & Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x111f2ab4763a2aa55275efd4e267b827f8b12f5440cb71b8797dc49f1cf294de. 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/USRUF1010382.
Homeward Bound (Arr. J. Althouse for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bbf7a5f36956e851fe287e1e1c01e59597d4e0aceeef960afc128ca821b630. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USRUF1010383.
Tannhäuser, WWV 70: Beglückt darf nun dich "Pilgrims' Chorus" (Arr. for Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916f8c39fb6a44415b1045dd97ffa9eac286abddf2a7e84368e4ac9ca2c71646. 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/USRUF1010384.
Saints Bound for Heaven (Arr. H. Helvey for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe53ac718b65b57d38680f408f2d3ce7d50ad72a453fd60bcc498d2b912d8c7e. 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/USRUF1010385.
Ain't That News (Arr. S. Hatfield for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754d0a94fd05501db2cdc601feb7544e0ce4547e273f9b9e9b5298a9c8a3f716. 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/USRUF1010387.
Have I Done Any Good? (Arr. D. Zabriskie for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3abec4110bb122fbff226735c6b01a9c946719668eca7f377fe357235c5929e7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USRUF1010388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb75e4b96c653b9c204c3bca2a5e2acc8fc67eafe4650a122b1bc6add33c5f53. 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/USRUF1010389.
Hallelujah (Arr. J.S. Applonie for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea3191c03fa939361bf62a49843b90c9a59a7e4b729861076897c75e4aaba05. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USRUF1010393.
Come, Come Ye Saints (Arr. L.J. Robertson for Choir & Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096dc4a77130e2f8eada4016b9cfcd2675929910ac30a8660bf292de95cc0a2c. 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/USRUF1010397.
When Johnny Comes Marching Home / Keep the Home Fires Burning (Arr. D. Zabriskie for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9730b080259a2e15e01a8b4ee0b1081aac65fbee977070582f2cc7bb6f214e2. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USRUF1010395.
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
If You Could Hie to Kolob (Dives and Lazarus)
Lyceum Philharmonic at American Heritage School
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e416f60600a7259632294b4bb8cd6a534789c963bd9f60df9da9ee9e9e5432. 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/QMRQ61800100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61476631e53f35ee8a0db75a1722f3928ca2133bcb05d61856c1b72a45bd5cd. 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/QMRQ61800101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391a85a4863abc5a2088167ee3968260c2e9855fe7405562068f2c7bfd5fce06. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QMRQ61800102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a41ea055e7936800029947b21335586a37ed23c5c4d0965b4e98791fd8c686. 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/QMRQ61800104.
O God Beyond All Praising (Jupiter Theme)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b8b9bfcb438dee6d3dfa1264dbd87d4f7f880ce312a069ddf8a6cad3fbecb9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMRQ61800108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739997b7ef9dc308ab45ca0b20925f02bd6fafbc58cb3e3a7a2fdc10ea463070. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QMRQ61800110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7a917c29089dd1f827a1a1134ae9cc50d1480a792f753ff818fce849cd8328. 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/QMRQ61800111.