Longman, also known as Pearson Longman, is a publishing company founded in 1724 in London, England, that is owned by Pearson PLC. Since 1968, Longman has been used primarily as an imprint by Pearson'
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 0xe0ce0a90a9e267188fd67b7cf759477d1e4fedc17e07c0603bbf3a6590a3dc0a. 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/507accd4-703e-471d-85af-6bab2de000a2.json and https://artists.proofprofile.net/proofs/artist/507accd4-703e-471d-85af-6bab2de000a2.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 0x9c7120e6c263491e62c37702183ff03b639fc433702c701374b1be56b4ed52dc. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/TCJPA2480901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e2b8ca872cfabe425b4d11b218492b716123901344afc362c9eb56b78bf44f. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/TCJPA2480904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985d72ba54ca19e243b44a2cb8f86cd4f5acdc45ffba95416d86613483795116. 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/TCJPA2480906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bd4a93aab772ce824d5a353d0a0d7d77ca2771054b37c939c38c6c4d4f3c0a. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/JPR751500877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8977a6aafce0eaafbb4375ac0c4478a7353664443289dfa7f367ca659c73896b. 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/JPR751800158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aff355274f0f2637d66cb512a0727b00c4ee0a83995045087d799b08a28348a. 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/JPR751800159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857e54447e7c4ab9384077d8f6ec00698a5c3c97a7c08eafd35fdf2f3c517377. 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/JPR751900040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2254467fd142843fb90052a7d2cad4a8ecbaadef458acd41c71f694d179b5cc5. 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/JPR751900039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd366e41db6900e82c001c6f7471a9d4d4e83a25ab0492ee7fbf27d855c4eb8ca. 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/JPR751900038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda423ad1b59f70ceb3c7e65ec189f792a22b39919d13dbacec8508a64281fb6d. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/JPU901903679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba3d6be687a22713e839291002c69938e56cfb2b7c95f5cab720cd920804dcd. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/JPU901903680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cbdf43952bdfe54643c07008e1b42d7ab18e121ccfe72fef80318932c2dbd37. 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/JPU901903685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924ba1677f5eb1748d41c102e0c4b0c9888082bdefb872858634e0276dd386fb. 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/JPU902100549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ca0455385e5c8e50794cfa786f8952ea9d1506209cd0b35a5d376821960a40. 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/JPU902100921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924ba1677f5eb1748d41c102e0c4b0c9888082bdefb872858634e0276dd386fb. 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/JPU902100549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ddaa27ccf9bc091125288e7ea0e8f53f305d88ef4bc55380815de1463dc9de4. 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/JPU902200549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f601b29876813c67b0a9a18de4604ec5798eda8ff1f482eb556e125c4a3d685. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/JPU902205125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02ecd374fc6ff4e31cf1f60761a8d5dc2a8d14a8c61ad606a9cc64dec73fd5f. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/JPU902301562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb366cb8bf04f0b1ec8a4d02d5125b7be51e6e64d896fa36e7532257c4ba9c74. 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/JPU982304633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36907bdb3408014b7182305e531190823310c97b37b030393ff25659b5ea36d5. 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/JPU902303202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b905da94072cbfd594afe0a136f36709dfc195e01f6ec40564128d4d9f975b. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/JPU902303204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ddaa27ccf9bc091125288e7ea0e8f53f305d88ef4bc55380815de1463dc9de4. 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/JPU902200549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d903b9a28a6e121f988bdce061ddc2e303cf7aacbfaea8613ae469744cd88c5. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/JPU902303748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eeea70971a1474b53bb6d7766b4f8851ac1f392502ba3525d5880148ebb1a77. 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/JPU902303750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02ecd374fc6ff4e31cf1f60761a8d5dc2a8d14a8c61ad606a9cc64dec73fd5f. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/JPU902301562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f601b29876813c67b0a9a18de4604ec5798eda8ff1f482eb556e125c4a3d685. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/JPU902205125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e5ef973c68e1ce28478cc4b684bdbf1dc8e7e9e63f6807dd4620adab893fb4. 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/JPU902402340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe512bf1e1ceb3ba596f9b3de76c527fb4a874c89e43b4e495a5d4cf2260f6bb4. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/JPU902403484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b35685d10f2955e4e93cd308a05e728d513aff027be7631e4e45cf88bd5044d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/JPU902503083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb283380dc7046837169fc73d798c32ced2c3d9560367de000ef93f77d93aa204. 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/JPU902503085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10b48b24f70d32bda91a6d6a6e1b52de522dca1d40ad3808991d6e5d63dc9278. 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/JPU902501749.