Louisa Lynthia Mark, also known as "Markswoman" (11 January 1960 – 17 October 2009), was a British lovers rock singer, best known for her work between the mid-1970s and early 1980s. Her 1975 single "C
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 0x451ea336969f3c2865661837e78f8d043b5017e7d0fdf4fcb179e839ffb4c076. 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/a00bcf61-0503-4949-8db8-15c86db072a2.json and https://artists.proofprofile.net/proofs/artist/a00bcf61-0503-4949-8db8-15c86db072a2.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 0xbbe6a99f0f96bf78ab6df447757065bb74c6b7c337446faac10da551d2510749. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USQY50825559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2168ff3eb9d7b3e667d8954ba3b0509bedbcbe0e14920cf47df927ea2e5d033f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USQY50825560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89d31ec3e639f60e52ee7623680e7f7477964fba06c4ef8faf1116e669455b5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQY50825561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655590a0cd667f5f5304e124e7184aeae9eae4fcedc3ac1b605a5e1e2dfa3562. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USQY50825562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9df74e247a9f72706489aa6d6772bfbfbda4b635e766d06c03cc891f5bffb55. 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/USQY50825563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5b40e3aac0f13750572f51f1c0ff1ab50625e3e3fec7809974e3911e7765de. 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/USQY50825564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf84b4b80f8c10bfc7ada06a84b1032198ee2ec56db0f1f019bee26dbdf72276. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USQY50825565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc128f08fe08b87831566c1b43e9fdd48e341c07328a6bb522deb96f39559ece1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USQY50825566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61772e65757fb6434f1a938d05d86b58b1920d1fe79828bfe0167b6b57ae7883. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USQY50825567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be8cff6506c59ff580f5a6e26f4e5d7d0476982bb656b0e5135156158c1ddb8. 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/USQY50825568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe43259d93544fce9e6141e49c2c61881eb0f811eabdb3670667a171fb45429a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USQY50825569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3399f63fe07c03e95cdfb4e9ad080011a3e3d1292e3e0b3828a065a9d6439e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USQY50825570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f8c825e3b090b94c397f75bc5029089c007af6363371512ad2295a5b9e7bc0. 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/USQY50825571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434d982196f9a5dc80951c1c2d4bb23646d0300b1004202d983676ed8108d281. 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/USQY50825572.
6 Sixth Street - Vocal & Dub Mix - 2022 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247cd02cf20f7699b17f51f81f5955ecd03ccc1d85849b1c95ff938acdd7f770. 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/GBKPL2292567.
Queens of Lovers Rock: Louisa Mark, Janet Kay & Sonia Ferguson
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1335960317abd29d930a1d69ed48be672a0b237867a75c69a01d678096ec056d. Chain 2 (Bitcoin): anchored in block 958861 (2026-07-20T10:02:52Z), 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/GBKPL2202991.
Queens of Lovers Rock - - Continuous Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c8d8852e10425b0143947ad334f5a6445ad28e5782bbc2ae0d1155f18a510c. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T15:48:17Z), 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/GBKPL2202992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf21d41f2fe0ea233bfbcc0239e4e1e7dec550686aa321b59abba19eb53288edd. 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/QM4TW2360905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6174cba787fb18b35ea0c8357f7dc38be43fa0183dd2f85565cb56a026ce739. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBCMZ0800013.
Reggae Lovers Rock, Vol. 4 - Continuous Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc5620064bd51c578eb0872a7186e6184bde9ea48b886451285dd3b2da9da4e. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBVVQ1900140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6174cba787fb18b35ea0c8357f7dc38be43fa0183dd2f85565cb56a026ce739. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBCMZ0800013.
Lovers Rock (The Soulful Sound of Romantic Reggae)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3208141ec1dbd8d8a1d6fa9dc90d6b8dc3ec28d2ca4f16421b9134e8069adb72. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/GBAJE7900273.
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