Kim Feel (; born August 27, 1986) is a South Korean singer-songwriter. He was the runner-up of the television talent show Superstar K 6 in 2014. Kim signed contract with CJ E&M in May 2016 and manage
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 0xf0a2d10d44a67df2a431aba1a053fecee8ba36a91b04bfd840af68c88f4a5ef5. 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/b18cf2cf-93a0-4850-937d-e0b6b7c11008.json and https://artists.proofprofile.net/proofs/artist/b18cf2cf-93a0-4850-937d-e0b6b7c11008.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 0x807a6babe571dbd31c478f1c4f5414beb839221efdfcbeb08332e9271a43fd17. 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/KRA341403695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07259c16c91308e080b74978ab9af70acb649d4c4d0570d6ce3b26b91c6a9b9f. 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/KRA491500398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f9e008179032ad2d2211d1b7a03ad4e274beb9d47fec419e5cc6ad74ee4fd8. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/KRA491500402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29677312ae7bc63d7c375983f779cdaa8413d5479b97ec8233b1a6447f9f9fb4. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/KRA491500403.
Reply 1988 (Original Television Soundtrack), Pt. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fab8348092118f898d0c05ee9d479287264ed567a040ced08a6d334dd74d810. 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/KRA491500948.
Memory (Original Television Soundtrack), Pt. 1
Step In The Sky (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3756bdbca0a36cc90619fb3a016a10a50ec55c79e33dbaada6709a93064da559. 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/KRA491600792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3546936a7f3fba160aa360357321ccae54f7ac949506e81a596bf97d9d4ace6. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/KRA491600872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6635ded12753013cbd407c9bd4f362782138a0ba1e55a79f02b0b4f411adbc. 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/KRA491600873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278e0c714e88f596884bb246febe143f546690824f5a6dc28bf1997aae7708f5. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/KRA491600874.
With You (Original Television Soundtrack), Pt. 2
Abyss (Original Television Soundtrack), Pt. 2
Abyss, Pt. 2 (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0fcd4200fa6d93d01762c0d390b6193ff1136a55280ea72b69511a9493a909. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T11:04:11Z), 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/KRA491900321.
0 이별하긴 하겠지 (Monthly Project 2019 August Yoon Jong Shin)
이별하긴 하겠지 (Monthly Project 2019 August Yoon Jong Shin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe756905335098717f807e6638849ab96743866877de0ecc0d76668cb39562f8d. 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/KRA491900893.
When the Camellia Blooms (Original Television Soundtrack) Pt.8
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc50678f3aaa659f19d02e8be12dc55029832111b30faaa39ea4390aff2d447. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-17T04:16:13Z), 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/KRA491901180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05eb1bf84e2d9fa83ae288f7607030233edd11e44546ab27109eddd88871e779. 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/KRA491901181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a86f089a4db498533053606a19437520e98a22b3502aa7a8f8a10c547a26c17. 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/KRA491901182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096f9315340633dfd216ceb4d0688d2e3675d3f1075a3cdedb3403201007426b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/KRA491901183.
ITAEWON CLASS (Original Television Soundtrack) Pt. 6
It's Okay to Not Be Okay (Original Television Soundtrack), Pt.5
START-UP (Original Television Soundtrack) Pt. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x402b389baa40c2d59bcd7379b1944fb109c2785236c4f0f85f70e8560887c288. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZF452006793.
[Vol.101] You Hee yul's Sketchbook : 65th Voice 'Sketchbook X Kim Feel'
[Vol.102] You Hee yul's Sketchbook : 65th Voice 'Sketchbook X Kim Feel'
Jirisan (Original Television Soundtrack) Pt. 1
智異山 オリジナル・サウンドトラック Part.1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1259a957430f2e77b40f246b40083c47e123d6b31bc6a437d71708fbee683542. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/KRMIM2142361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7701782fc544c2f742dd7cbb75461a0ef1582a80a782d52ce51a176368fd0d2a. 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/KSA002101520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546ac7de80633dfa3b868587a8c8ff5a946da808c0b6cf9a889e2fadf8f04a7e. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/KRA602200401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24edb32b31b7a4972cef82ab7f14037b6274b67b8a5fbd00c1b8bf7f705c89b5. 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/KRB472200594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ace8ae2b497595e1451003b49dabf025eb5693569f8d3a2c2a7c54c1134df83. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T09:58:01Z), 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/KSA002200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc6ae86c0dd8cae3188caa73a555c0a3bc595e4695d71c9faae6f13ace813542. 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/KSA002300972.
My Dearest (Original Television Soundtrack), Pt.6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d3951ff998a7c3be4e85f2533f99cc486d4ce8a4cab4d28940420ee7aceab3. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/KRNAR2320859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed09a2b1659f98aaf8a3f6893b6557d11d560106de73ee09d614a4194f65056. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/KRNAR2352256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a69b8c536771e6cf89366d777122f8b8b1a307ee9bc0837d9e56fa29dcfa4db. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/KRNAR2352252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593b20fc586bebcd0283023142a755565564096ddd3dd1c8287ea20ad51c16f4. 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/KRNAR2352253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444023356456ff5921e588ae2d498a1009a5ab8f2e2b6d90445ed705e3a0cb98. 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/KRNAR2352254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc607cc243d267529826a8ad9bcf924445e7739ff2867954255ab7094881b225d. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/KRNAR2352255.
White night (The Last 10 Years X Kim Feel)
Family by Choice (Original Television Soundtrack) Pt. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399451ce2c30545a3bb9ccf249cf9a0e4cbc68051ff31778f724a2b59b51d787. Chain 2 (Bitcoin): anchored in block 958554 (2026-07-18T13:17:01Z), 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/KSA012357834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7303cf7e7d9378ff463539a35566e2836d2053bc64da2e501d4d53f6a6fcb994. 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/KRA492500788.
START-UP (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d5749e544bf30c6b7d178a323534d3cac0e717c5db20d174e0248876552f32. 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/QZF452006792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x402b389baa40c2d59bcd7379b1944fb109c2785236c4f0f85f70e8560887c288. 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/QZF452006793.
ITAEWON CLASS (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0a1526a34da2af72b2412c453fab447070f08f9ced8a639265cf0b154448f1. 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/QZEKE1935005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56141d9461b429e2b25de26f846e637bbf222e35efcd5514acccdbd86c8e17c. 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/QZEKE1935011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ed03f67583f6b67759008b6d97da235512c61b2ff6b2fb5bfb8bda71fd6966. 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/KRB472200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f48e2a2de614c8bd9df0e20896a9044d83869cd6dd490a0a1e8b452129e8cae. 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/KRA491900699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5270e44ee60770d811891fab1ba2f377701324a67c1d317b830cd8963d52a1. 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/KRA491900723.
It's Okay to Not Be Okay (Original Television Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a7d542c54823d725c341edf685550320aedd65312dfa604b769f7da1784fad. 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/KRMIM2019911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a80dcaa82c0aa3d252d9f48e1a2a33bfe4f6e28e69b652a40635200da86741. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/KSA002200011.
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