Holy Ghost! were an American synthpop duo from Brooklyn, New York City. Founded in 2007, the duo consisted of Nick Millhiser and Alex Frankel. History Millhiser and Frankel both grew up on the Upper
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 0x56cff9d9fc33657771276fe68d018a43ee4e16d17c555832bce536e876b7000a. 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/e2bdf953-adbb-4a03-81bd-c8ac56f812c5.json and https://artists.proofprofile.net/proofs/artist/e2bdf953-adbb-4a03-81bd-c8ac56f812c5.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 0x9f83ae794e3f326d17ce74beddf2531aae15876e44ce12131d27ccf9ac5bede9. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US4GE0700102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d474dd6bd3c84c8583a083286397b3b5d0d52309329f10d81c496467df8a0d. 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/US4GE1100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b73374ed69d14aa8e8812e88a9d6a5682b0daa1024a2f07a8a28f2a6723f96. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/US4GE1100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc66d200e499aa4b7eb6f77a14380ad0cd147ddf02ef7289a728ca2b6bb89a41. 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/US4GE1100036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113fad80fd557c92171a0acda808616086e6da0554ae09331735c3c92c81de46. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/US4GE1100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9518eb77a6bdf7ed9c2e46c7940fded889418c9763b5556349325cc1fc7dba10. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/US4GE1100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x436b1247e1ec6245859555c7a406753bb07e2c6614894283d01c40809118860d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:08:51Z), 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/US4GE1100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cbdd11880c83604a5bea1e4efd4a73611a51ced9aa6956f27df15eb5f31a53. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/US4GE1000053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113fad80fd557c92171a0acda808616086e6da0554ae09331735c3c92c81de46. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-16T00:04:17Z), 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/US4GE1100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0f2a32e61413dc4fd73835e26acd4dc5df53fb0eaf3667e3cfe14e2a8eb43a. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/US4GE1100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf15e59306d3340c0d5e8bfb8deb54aff0e39fd9b07f4d3ab4f9a2b7c03fab4d4. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/US4GE1100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693e6b4e0e7257720c10b8c86ad5832ea94e87c5b7a23d6ab8a9df00156e7120. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/US4GE1000052.
It's Not Over - Dimitri from Paris EroDiscoMix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3027ebfe3d8dfbed79de3751c8e165be0d32fec328db84e7f354cd5a57a36485. 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/US4GE1200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a70f9e3c8dd77e525b6a207f590ee4b153bbe3d657861c58813b8b423d73cc. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T14:06:06Z), 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/US4GE0900063.
It's Not Over - Dimitri From Paris Erodiskomix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3027ebfe3d8dfbed79de3751c8e165be0d32fec328db84e7f354cd5a57a36485. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/US4GE1200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c3ca1ec9693b681718dfdba8f59853dfe3bb6bcd0fb6e244bf823162ada96d. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/US4GE1300097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2a533c420666165d0c723c4430d090a61c75c0b9e7434adfeaebdafefcd6c9. 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/US4GE1300098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17aeb37fe598a305659cadebafc12c79c1486886b5564d23d31f3fc6ee6be9b6. 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/US4GE1300099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaec6dfa0f398e8cf8dddcc4016b9189573ef7ab1d56084388f4220bfcd5617b. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/US4GE1300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2a533c420666165d0c723c4430d090a61c75c0b9e7434adfeaebdafefcd6c9. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/US4GE1300098.
Bridge & Tunnel (Prins Thomas Diskomiks)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5262d6d7131584a3a91991bcd6dc47a6664fe3fcbc047d1d737cca403665de9. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T14:01:58Z), 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/US4GE1400014.
Bridge & Tunnel - Prins Thomas Diskomiks
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5262d6d7131584a3a91991bcd6dc47a6664fe3fcbc047d1d737cca403665de9. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/US4GE1400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a4f50eae5dd644ce3e8171ff1066ac5d0247ed3fac4d96429bf42ba10ff9f5. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/US4GE1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311f09267584326e6f82bddd4993810864e7a16ed129fb88fe9c0d6e64a4abc6. 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/US4GE1600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f5c1d319c413435048c044592681bb92dfab100a74aaec5c2b1c920a656eb3. 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/US4GE1600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a4f50eae5dd644ce3e8171ff1066ac5d0247ed3fac4d96429bf42ba10ff9f5. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T18:48:06Z), 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/US4GE1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311f09267584326e6f82bddd4993810864e7a16ed129fb88fe9c0d6e64a4abc6. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:32:48Z), 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/US4GE1600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f5c1d319c413435048c044592681bb92dfab100a74aaec5c2b1c920a656eb3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US4GE1600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8329c2a8aa7624bba131a7b69b5c6c673fabc9cd7f88cde7963a421c0af2858. Chain 2 (Bitcoin): anchored in block 957919 (2026-07-13T23:58:45Z), 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/QMRSZ1900326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd9e0e53a191bbdd977d2b498dc807d217401199e54b95aa7fcdd9945e85f3a. 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/QMRSZ1900328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ffe99da49a09b0218873541c9e8aec47f255f23f7438678dbd35363f4179b2. 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/QMRSZ1900329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32dffd7e3dbd0c2fd659d33181b9ed69db2902a78f1bf5643019a9fc2de5a2d6. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QMRSZ1900330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e4bc0177b1e425aa19fcd2a5567918c408d8796695c7534e69107e06be3d84. 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/QMRSZ1900331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c414ecc97fbedb7879bca20896be0726f76a6d8a828408ee38aa704f311c1e. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QMRSZ1900332.
My Happy House / Nicky Buckingham (Justin Strauss & Max Pask Remixes)
Nicky Buckingham (Each Other Remix - Justin Strauss & Max Pask)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9784cc78075e24792d5e307f3fd87803ea6fee86f17c47dfbbbb64177b3e22c3. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:04:33Z), 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/QMRSZ2000169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd997828a1fd7dc5e9c12c82a824948b0921c98e12846e2b504371211f67540. 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/GBEXH2100065.
Working The Midnight Shift - Holy Ghost! Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74bdf4d6d49cb18905fc227da7368d636b0a30c16367980d574ee0447f341711. 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/USUM71311732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74bdf4d6d49cb18905fc227da7368d636b0a30c16367980d574ee0447f341711. 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/USUM71311732.
Business Acumen (Holy Ghost! Cover Version)
Kitsuné: Business Acumen (Bonus Track Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e51aed17776f0fe62e82b207a601f6fed1dddc2b9e30c1c2676f2525f519a2. 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/FRU700800071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b927e0d47646f3b637218c9c8fcf8983894e0a12835f1be9becfbd9a05149f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBBKS1000004.
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