Garotos Podres (Portuguese for Rotten Boys) is a Brazilian punk rock band formed in 1982 in the city of Mauá in the metropolitan region of São Paulo called A.B.C.. In 1985, while Brazil was still u
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 0x0176c781aee49723510d58309f842268a0a29b95b099b5c9e27cbf0ef141ce0e. 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/6593b8a8-f894-4bdb-98f5-57cc855d98d2.json and https://artists.proofprofile.net/proofs/artist/6593b8a8-f894-4bdb-98f5-57cc855d98d2.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 0x64af35163852b748230e112fc846bc11afa1899d4b3492b2aea443dfe5970e51. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZW9K2414532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386e3ca8541a15f403a6ab1362ba0c0e710b40861fac6e7f7a7b1e5992329a95. Chain 2 (Bitcoin): anchored in block 957726 (2026-07-12T16:04:28Z), 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/QZW9K2414533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2db02544d9117bb9c73c59c91b3303e9ade6d662307d123c3b0615499a87074. 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/QZW9K2414534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899424826b6d96e099d061e53f43cb191d225cdaab012a724f4748a442564487. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/QZW9K2414535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e78d819bdc0136e552b16f748959421639674c820e2add4da0804ff6282b68. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZW9K2414536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e05383eaeffff57c31c364a94e45525b4e78d569c226d2c254c8eba3877cf2c. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZW9K2414537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe05ac3d4f4bad88243d451f296c6dd0d477f4cdbd9a3d8710ba685c1042b01. 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/QZW9K2414538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e5d2efa1a17fc69e9e9410b0773d066f114dcca25bd3202b3e6d4fa2db8a45. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/TCAEP2089409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8164498a551b53fe4a5f9dfde76e53d686ceb41c2f6805577966f6d0a088d4. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T22:22:30Z), 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/TCAEP2089410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dab51495323e37d7da6f5012d68d1c2f3b0db0248c29f1ac73b82ba23f43d0d. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T16:01:19Z), 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/TCAEP2089411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a06b551da2943f4264a1d89c372ade1fae6ba49ae7ed0096d727c3bd3387e1. 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/TCAEP2089416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8e1e57ba9c301c88fcc0d8ec040bfff8d2a6789f076815ea78e5437cc28ff9. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/TCAEP2089412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e25567feca1b88f1a63ddc059d3cd001c80db106850143db42b8e2b2f6363f. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/TCAEP2089418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93c09e95cdac4063a41f65f96c71e91cd37f1b5822cf6022ee1db6e79732200. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAEP2089420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4064ec61ec18e0e7dcebb3c8656b089a9a09163a7ccb8e03b30a6301b13b8943. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T11:32:01Z), 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/TCAEP2089421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56789495dbedde91de72bbf981b683c2da5e9ad3454b4b8f85cae38e75750506. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCAEP2089422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b76b0777a13c0f112a0cbb066844fa4f99c40a8aacc415be444485b7ad2a1af. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:30:21Z), 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/BR03D2101279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a5b5cdb4705c8f0f0db173dc74e8ed946616d6ff5aa990236ad1a1e023bbe42. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/BR03D2101280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40d5b3247eecad272a55230ef8ba46b75b7acae0b79b8ac07d111f60a643749. 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/QZHZ61908601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e0ce909604fd0ba174886afe1ba878a6ce5f4a28ae5ffa3a7648fdf30a127e. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T16:43:33Z), 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/QZHZ61908602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157640c12049881c37665cf2392a6b89c3e1cd3d7fc44fc694ee4d3564c49d47. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZHZ61908604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ab39a6952e8991dff04a2029b69f649f63a5dd48628ea9fcb14bc96942870c. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZHZ61908606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60f9f124bfa13e678416f090625d8c8c5f72d267fb63afafc0ada071325c49a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZHZ61908608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefdab4f9461f1a467be3ac6c5121802973bc17ac51c6761070a8112649c14532. 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/QZHZ61908609.
O Satânico Dr. Mao e os Espiões Secretos Contra os Coxinhas Renegados Inimigos do Povo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3458992a4643d588ddbaaeb530db622d81e53d5dfa8f6a83e766e5a4d99da307. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/US7VG1714101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd740cfd9825f4ea6f1c6bc3c2a6ab27c9a0a07e173f3f897401f9b02d3805e58. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/US7VG1714103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ea0260cb07ff322014495b3176d8c67edde4daa94ddf2eb21275ee215a2ccb. 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/US7VG1714104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae51367c195933a9f8aba7969abc7f6657eafda2854bd39a87de35056ffc978d. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/US7VG1714105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa033d8eed363ed19ab639292ce54034febee79d1706bb3f2d1d2fc4bdab3b127. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/US7VG1714106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01afed55d15443c5776d829b0c63c810c2c2e08b46584893e5cc2bcf41790368. 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/US7VG1714107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1280064f9ed8268b41bfc4315a53decd8c9bc247283208424f7aac02f7833553. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/US7VG1714108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9ab74d997bde5781c0270fde83369bbc62f988dab8079f9ec02b285cc11fa9. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZ5AB1904250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ac43d30382a1b00a5bf4fd4d22e21db22a7bb34a567ac324f6fe308b1b5cd0. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZHZ62237569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2343408675ed9dc4b0d57fe645450d7282d3f477a89db17de6f18440fec2ded. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BXXRM2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ab1a684fd19ad437434a602d31d05dc4e859edfcce02351ed66d813d892538. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-16T01:55:30Z), 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/QZNJX2406794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93fc134594a6664dee5d1d71391372d324a5531a24e767a5525ac9c224189bfe. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZES82522865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a633aa354230c4aabbaf6d36c76307ea2dec877da814629cb8a3ac17d25adb. 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/QZES82522866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383cbde4a9c39c8926ed48bfcc881ae9b1be5947d1c88079a3616b160757ec4b. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZES82522870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025c95e81de6026eeae55bf280d698c1ab760e3568cc384647dfcc9139d85fba. 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/BR03D2101283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3840bf37960801be568832a6136d2709df0f3b759ab3a5dab7ae53921d665713. 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/BR03D2101276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2468620464017640bb4bb726da00d961d32594876283d08d2376501d7a7b56a5. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/BR03D2101282.
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