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 0x2362845fd5c3eb2a06af6a02b2e8d0d12bf362319ddefaa05d78b00380debe05. 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/4eb153c1-697a-4e31-8336-a81e1128f46d.json and https://artists.proofprofile.net/proofs/artist/4eb153c1-697a-4e31-8336-a81e1128f46d.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 0xaeeb4d5b06fa20cbe71a90ecf596eb98e7f2c8ae238fadadd343f004beb3dda3. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/BREMI8700182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da4ddcaa4c03e001c45c67b805e677ce0c4ba40cbcd2bf0ce83ad5acf8d7dcb. 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/BREMI8800267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94cab4442dfc2bcb4662e26078705dfcb9fa2c93be2aa4eb326c7c902a342d27. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:38:38Z), 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/BREMI8800469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195df095afc6ca124c18ecaca4f9a1e08034e748c1e093e5d62c20b7ccb913a2. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:06:16Z), 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/BREMI9000178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5c708eb3aa7c43d03e175b7ea2ca6f6c72c5343f46678f55b1a6dc7e593673. 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/BREMI9100054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357c8efc50c62d883b61ef5e2bb30d6c8ac74f8a3efad8b88d309945ff1fc50f. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/BREMI9100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a97bc2df749d996cf8bc162541b5533349bb2262e2234100f5f56ed5314162. 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/BREMI9200039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6634fee718f51b5dea9befad14a705af77eb441f4c73ece744462e365624170. 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/BREMI9200038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21f0e91a2b1d58e9cbe8893c5319f15c8af69303a0cb9cd3c649f2ef0af0c44. 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/BREMI9200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3984560103a16c3159806d84c8521091c7e06fffc7d1a079a9a3863a2b8887. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/BREMI9200974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e52a0fdd4cee96d91576dd5401ca968264cb9915c666153861ec3c8e276968. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/BREMI9400295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a3454143dd0371d05a3341b6131dd42ee25f4a8fc4df244ee31e1abd72f54c. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/BREMI9600400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3d30cc6da8df3c529886ee5f6c1d8c5c990ac039c610f8b5aaff5c7d52732f. 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/BRLHA0700027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb18c4923f88209ff57cfeb4edbf9d989353fed6ef6275290a7fc74e19bad771. 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/BRLHA1400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf60706846bd686c1d1195830986ae269ebc6d8664659565714dfe8c1333a812. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/BRLHA1400059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3d30cc6da8df3c529886ee5f6c1d8c5c990ac039c610f8b5aaff5c7d52732f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/BRLHA0700027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5403a6419bc8f97a86df9381d4c409f1fe26a5776388bb31be37208dc5fd38. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/BRRPG0300282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2cc5a5fb373063a3a3027b7775d1d1e21b042c2034a5b36430fc96ec51d275. 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/BRRPG0300283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b94ad8e9eb2e4747e2f01f2f356ac5d0a127fcf4741a953fc4b9a05fa05009. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/BRRPG0300285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a67068cd500c645a6376717a63859794bb6f45b25bda80675912c25f84fedc. 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/BRRPG0300288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a49c14dc83013c60984840f2edbdedb2c75b617e4640bde702b248e9f63421. 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/BRRPG0300289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09aa060c515485cd34a04600fa2b2074a936e29d0f925bc090e5e689d90b021. 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/BRRPG0300063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc1c646f2481fba27984dd23a84681b9aeceb689c6a951de84ccb97ea4c8c7d. 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/BRRPG0300065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa22f921cf648d4821b94ad8fbd26a6e78f0ad078dab996dfd73572af423b611. 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/BRRPG0300066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce712b0925f292b423818c0d5631eb5e7e632d72828d0d2e9e49bae9e3c2d1a. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/BRRPG0300072.
Mara Maravilha para os Pequeninos, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a3b36ba17b805f10b8032f89a5bbf9dff8c9ca9c5b2837e28a26bd70b11a94. 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/BRRPG0300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5123732efd5d884346cdf9ad3c0bf3094757375df3341bac38d3dee400e9097a. 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/BRRPG0300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e81c4df3a7681124c43e3430e7320da20cd89e94dfbfb3f28ec86c9d94ddc8e. 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/BRRPG0300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044e24693be85c0ff3c16bb7e9eb007c3f464033a7cd393c637290cc150e8fc1. 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/BRRPG0300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6501a1ef7a6949ff595a2f1cbfe64edf45a89718f23ef4a36282e7be976a7d. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T08:49:32Z), 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/BRRPG0300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326591487158833a143f37d06c26870183d6473b76e4bd389d2c175d94ce2f6f. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/BRTRB1754719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3977cf5dde54c4dc0d25cd324bbe2e1ea506dbf90b4bd89ffe65401cf241ad1. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/BRTRB1754726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf217e3061edd2d8c4e46207547bf6f1eefbb097fcc5d3d50e9f983dc57a64b. 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/BRRPG0400099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5028fe1f7f4be960409928d36b40cadacbfb6cd548792a11a0baa7dc475e68b. 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/BRRPG0400098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb2b0907fa9e0d008f6b59119dfcc177d74ce6de9835d2236595d2d99434acf. 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/BRRPG0400090.
Mara Maravilha para os Pequeninos, Vol. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf90d012346717f0052efc0a2ead7a251f38a1d2030e750abd7e514fcffdb588. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:42:50Z), 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/BRRPG0500173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3011f6f8cff935c1054dc80a775e820a84e8a9dce644545558d26ce77c4fcfc. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/BRRPG0500155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f300b391abe3d619f81bd92f5021a42087a8d8e7a55e482ca2a0da61418af1b. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:21:25Z), 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/BRRPG0500156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0dde5da835a9f6d2cd4bd214941ba109ef36f0632638e4a58847b9e9ca7dce. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T02:35:51Z), 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/BRRPG0900069.
Mara Maravilha para os Pequeninos, Vol. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0faec6e35aa8c88efdc0ec11831fd2870982fdad3c6f3100515f9a2c7a48e5. 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/BRVJ90800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86b397181080696fe8cd059ca284a9e29b624a08f18cdf7d89e9b7d084c6108. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/BRVJ90800004.
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