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 0x0ffad6e993324ec9d10a33f460e83f6d040114001f387be56ae77a97e959e96c. 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/fb62ea2c-c7cf-4742-882e-ea68a7cab8b2.json and https://artists.proofprofile.net/proofs/artist/fb62ea2c-c7cf-4742-882e-ea68a7cab8b2.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 0x995180fa45f56075f8da582bf9ffab20f07df878e4ca343a6b7c30d50f5bb233. 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/QZNWU2277925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42e367347eccacc20ed948f521747bb355c05fb10a1c99d15134ad2e4c8b7e1. 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/QZZ7S2429159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0ea1e348fc54a88603f0758eb4ce232b5a0696c1ec0063439092a33e1e020e. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZZ7S2429161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c782ba8ae294c8837ecdf9ddb33c31f45aec0b8e875fe119103d0c04d606ae. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZZ7S2429162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083105570f0bdc5bd5e64a71d36293d01362444ff1afe3f7fc782eeccc18a38c. 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/QZZ7S2429164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55ac0fd94cda695917e58c65d2c68a637c647f2003fc8c3d53c16e676f03774. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZZ7S2429166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7af8a3b5d49fb63dc3b6235f5408fa317741ef815ef0c2643c6fe5a962be663. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZZ7S2429167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a084c0752667d0bcd90f607027a59078cb1dbdba8c4bbea5fdab319b977647. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZZ7S2429168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66afe623485cc3f68655bfec8220e191d25661e93f0132590b898031836956c4. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZZ7S2429169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2159e8823178e554b90b73a42ba7d79f8945877c8e472bd3677f6627606a9688. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZZ7S2429174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abbbc23d07d8bf75e97a71e5bed4ff2b7349c9c9d2c2b1e1ea0a25e81fa8350. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7S2429175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9400886e7671b8960525753605e7077ba6dd5fba294232c54eaf17d0709d5cc7. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZZ7S2429177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb778d73cbaa60bde3b033659e928adee70d9d3266415d1918bd40fe50e9c1c40. 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/US38Y2540434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859d7b8f6394bcd8774b83a50b75621cd99ec2f524581b603c540b5c93341443. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/US38Y2540435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344330fd8fe4b4d13efab111197d4237ef9af4dc31df02d462c27beb0eefb640. 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/US38Y2540436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c32e8115a8c13c35bcc8b561b3c17d3bc47d7dbaed50b57ab9be8ba623e7417. 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/US38Y2540437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a641c61edb50e009995a18101e1b80f42292adb98d476214b583df172441f5. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/US38Y2540438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5518a3ed559f53b529f21536d82542b1eedb963f62afbc64175e587cd868305a. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/US38Y2540439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18c03cf8a1974b7c03499e8f6af48e2bf90949020bfc4a70f5dbf92e7b26314. 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/US38Y2540440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2281bf766d517062a1fe27f06e67f79b4275704badf1c1d269064fe5e64a2950. 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/US38Y2540441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963dd684a8fcf0fe399ec7313a78ea13e9e2a664aec81373fe58277b1be28cec. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/US38Y2540442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d48ea712fed3b4928b6c9bfb5138cc1029490cd2986bbe02a64a19155410f65. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/US38Y2540443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2966feea362dc529355251a921c486326b2764c7556fbb8ad9ee5bfb0142cf. 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/US38Y2540444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e5891bd7c55fd9a577f5358cc70b94662b00a9e1e8fe064bf7b49918d4b3e8. 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/US38Y2540445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d334b1872135d406022ed217c26f65ebafa443a77a439257df624313e2f55fd. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/US38Y2540446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f50831b61facbfce6df892a78e820d20af195e542341a37bcb5f71bd41641e. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/US38Y2540447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe21535c7b0a459dc49b8076e860b6287c25904b3a0d697705182eab87cf823b. 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/US38Y2540448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb150b5d2de23b8b66c27f433aa41c980b99bdda548acae5d18ecbb96bd02d701. 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/US38Y2540449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a13367e7e20511f6008462ef7b7b6e0a4ed626bae37d96b2800f481a4a7219. 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/US38Y2540450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d70850e291bb8cc7e814c39cee9f43d8dd121144005ece78a7a90a39401287b. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/US38Y2540451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2593828367779bfd5282609a9e11c78ddb3938a573cd730d45f5d76335a9b9f9. 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/US38Y2540453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d78c4b1e8f177b00c5c7808364215eb3269b1f6c1f0621e4da2ab6b3c16e7d0. 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/US38Y2540452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263bbe1a065a5d54314891502f3b5cf165470f2b6403ecbd6c3393a79f73016e. 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/US38Y2540454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe307dbd93b8449278e362d4bfe7594a9db17730a9a69a7bb8091e983667be2ed. 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/US38Y2540455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4399267453ffe87863bb1977baa683c45ac9bee5fc9f4c308b1072aaed7361. 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/US38Y2540456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514cea977cccdf934e757c31f60cf80dc49ddd25232b9502aa0fc1bf404d14be. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/US38Y2540457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31a29c0876eb03e5a64d8e596f2506037214230a3ea3028160e4b1217d9b67d. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/US38Y2540458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8b3ad4c1de5fc6ae43dbb41551490be5db8418537ac88577d85d38d4e7fccc. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/US38Y2540459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2feac209d921b8a6a7e8306b17246ae9215bb78441d81b54fd81c2c8feca630. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/US38Y2540460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d8ee403e50506670c5c1e15b972fb9d9d93419e3d58b7741f2ff3b8cff61b5. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/US38Y2540461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b4dfd1ae0d8cf12c7bdd56d59889f705bc8a2b69bdf9bca135707728b8c686. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/US38Y2540462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3aed185362a3be7b12f775b5004b74f1aa9870dc7b0ad35b208a69a806f3af2. 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/US38Y2540463.