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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb4a47e5dcfdb9a3543a37b545776b5ee55c7fa71d315f50190ec30e4d5ef9a. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e206c120-7875-4d18-bc16-5059f123b281.json and https://artists.proofprofile.net/proofs/artist/e206c120-7875-4d18-bc16-5059f123b281.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56121e6a4f405ff347be2c02a0f6593e9361f172c10089e24b42dc5d6ae0ad5. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZTBB2421162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f9812af42c009fa942842564bdc44126f0c56d8bf6665849a70912a23b5cf1. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZTBC2434088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b811e4d44c064c1426f85b4cc10c6c976ee66c122de9203446dbf08ccda71a. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZWFP2489849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57407b2a8bad4a21ffbcabd5b4983f2c3c3af91af4dd0fe987c106e94f12bdd0. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZZ7N2428954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2476ca413a258e66e63a36910b15de76265419fd926d379c164ecec631ad395. 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/QZDA62560538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfca6914eac4a691c827f2a2d400ae0a087821cd8fc024dbba1f017d1760d4c5. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZDA72519166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fefa7dfb5d9e457754759460b0a12e23075f58766f2567ba6ded27655f84432. 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/QT3F32579182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad0af3baadc2a228c25b3ee89ed45d9bb39f9cad4c8901726a07d4e46bfc946. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT3F32579183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8c5ff79a400d2f3170a0b2b143396bbb361ce1fb6d3f6c82ddcac95f8a2cf4. 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/QT3F32579184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5445463fc6714bb6e06716dd077d170d3520d6027c2bd15e5ab183a364b8bd. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT3F32579185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94edaad3dcd255dc3478c4877c429bf4d214822ca70b97380e16b8c61b34bbf6. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QT3F32579186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df5aa678adc0619c43867c12ae6306cd171f97ccb7154600a3f996176868b12. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/QT3F32579187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ca59b6c85b62143f54d4be1ea47e0aafec9be2a34e1b530d78b75819c68e78. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT3F32579188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8af51f16651be8ef84eb6e355e4b32527f91c4af3e3362c0a987c785bc1cca3. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QT3F32579189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48cf74ceae48d2f6216d414afdd0a70bcb3294a852b95e7a7203a3bbebe4cb61. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QT3F32579190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c01fe005c1fbfeca023e9a35eabdfdf9a4b9ad0ef6bd742f84351bfbb53d43. 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/QT3F32579191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac089237716543d19a1b92e1be2e39a67adfbc8a4517f4cc1b1781b7d07e6bf8. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QT3F32572623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac81a32b1a4335502df4c6d64d08805949176cafa14fb781f4816b303621b86. 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/QT3F32572624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a643d11466f548b2c17d6ec9ef2ee60114a1ac465f8f37f296d4c4d60d50d8. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QT3F32572625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5e6ce9ab34f9989119e86d4c48034b896560be3d24d171aeddd822aacf8832. 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/QT3F32572626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b33d723a4032fdae312fc4b08584fefe86afc01d4fd501028f0d039849b5f35. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QT3F32572627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640bb1e7ea8e1ed3646530fcb0f5d85a1d9b0eb5450fa1537b70e9bebdd0e73e. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QT3F32572628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb310441d05413ae24b871ffdf7a0fec33f758ac9056d7b33b7f149e3f52ca5. 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/QT3F32582916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e90cf36edfa2b44974283279447e5c3bf0c79ad4f5878253b1e30a025c77b85. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QT3F32582917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3432ecd594825602797f52f30792f3d01f65c5e4400ece925c14e35cb741de5. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/QT3F32582918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb673e1b82f844fff1114bdf46cf5bca8a689c8fe8395f4041ba6672e95544fa. 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/QT3F32582919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f441cb2d41ba63f6c29d3725844a285a8e65728c6e288b706384bcff33ba84. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QT3F32582920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345b9a3aeedb8d50d1b3a5daae4eb72f0c8b05917d60c9dbe97763eef619745a. 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/QT3F32582921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88a0e7e2b2b97e611677706acdb6fda59a8dfb474253482e72df23640591ad61. 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/QT3F32582922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e3807dbc2f9dc03d3b21b12748a0dcae089e17a8745ffa2d2fde430a497386. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QT3F42537802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214212028b16647189260c177af1896f6cc340a61484f3dc772ac2c98e456269. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QT3F42537803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b1bdf52728e7bb16fe2ee897ff40b7d356bb5379344e976307fa0ab8b76c81. 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/QT3F42537804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd538601f1fa686ada8b628604b54e992e48dbea8b0837f0e7ebca4e94b5070c5. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT3F42537805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2047e436c335c9dbb28a2306f00692ba106cc3b1fe94069d5445b99c6f4c50. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QT3F42537806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb17936abd7d0b46692a7b5a17516a72b642362558c9085899da3ea2ab7a00f6. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QT3F42537807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b0b012807e554b603bf75a436c1c3db1b4bc79fb3ba74b5156588a391ce66b. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QT3F42537808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36bcbadecda2dbac43b8d6e17554f09beb30ea6ce8222b7c1e6adbe99f4af28b. 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/QT3F42537809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888bbb5f950e043628bc908160f33cd97a52c14ab94bb932c3b6582f04072021. 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/QT3F42537810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32cd7128d833164ffa09aacc0f03e373ebb609e2dc175c7b03fe84a4f31561a. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QT3F42537811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7637aeee7faa01fb11a97dca2af1cf4bb46a49970fd57ce3034c117442432685. 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/QT3F42537812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596bcdd25d80a96cae7980db1da42c231e61fbf89ae3e55584fa26208b8a0313. 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/QT3F42537813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fb9fe83833a29c2babdc06f42ded9928387c6967397753dc74170462e23aae. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QT3F42537814.