A vanishing twin, also known as twin resorption, is a fetus in a multigestation pregnancy that dies in utero and is then partially or completely reabsorbed. In some instances, the dead twin is compres
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 0xe120bb9d69c7d30b90e827d6195c870f7523e626131aad29d0884f5736f0fa0f. 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/4afd7fd7-9ee6-4d24-b904-4304a2384296.json and https://artists.proofprofile.net/proofs/artist/4afd7fd7-9ee6-4d24-b904-4304a2384296.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 0x1dd0a24c6e3f5b4183912d76b49e05ad583cca6b9221ad2f10fe9a2ba6a6f2fb. 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/GBUQH1500186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf55811b13a75fa15f189cc494f91336e64ebd6fe2e8be47c1b704d89dc80118. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/GBUQH1500187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d042b1e550ef3bcd5fbf2f674de8c03e48900c316ba6cc8d3f456a6d679d8c. 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/GBUQH1500188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a089c454d8475d8c3a3194c1ec9cb940f6ad347da1589e21393f1ddceedef0a. 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/GBUQH1500189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd0a24c6e3f5b4183912d76b49e05ad583cca6b9221ad2f10fe9a2ba6a6f2fb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBUQH1500186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf55811b13a75fa15f189cc494f91336e64ebd6fe2e8be47c1b704d89dc80118. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/GBUQH1500187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ca132d039fac800c6076fa598f51f5d7352d5e4bc0283119da33efe9d6cbbc. 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/GBUQH1500193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa90790edfadf3667fead8098aa83bb3125365ca249f577b77204ed96a71a63. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GBCKK1956208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa743f3235281057dd202e3985ffd3b64e4d49125c12ca27c8f8f3e1cc8ac6581. 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/GBCKK1956209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d93ce8bad21f40234e41687b327eecfcbf15ba9a38df720f0cda352cda3bc19. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GBCKK1956210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x229c2539f5708c777202dccfba3d0888c90e0a02c7c47ead3ae86ed5afecb629. 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/GBCKK2158301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378d866c835d20501f444953b4660b3fc6b0760d45eab26cd0628bb693311fcf. 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/GBCKK2158304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae3481c895e184e11d2ed1f876424f8618cd474263f1dff66179cfc3b2a80ec. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/GBCKK2158305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73317dbb016c4084a819df07ea63c43ca697147ef524d76e0eaa896e17d3ad12. 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/GBCKK2158307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d4dc7dc002ef965cc8027ba1a43268d233623912c05019e331fda87593577c. 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/GBCKK2158308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59d970401e4b124b361a22ce9c8d853deb5e8f01cbc6e5cf05e480da0dab2d2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBCKK2367901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba322aa8a9c198671a92d753f4a78683bd5a36b772c6271d66d4dc6f49b9c03f. 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/GBCKK2367903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33ab78851257969013b095baa0593edd049828df1c054fd8b235d9907a6e9db. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/GBCKK2367904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0960d41a83984881d3e3bc2e4d0ee763caa910857af91271c52fc82f0169d3a. 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/GBCKK2367905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50e9a1a88914490258e4a6e80af0491df5692d8a827b8804382b91d8245b792. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/GBCKK2367907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2075c278f5288953bfca8ade74a8b649ca2636dc3c6d525085a76f3b5caf8aa1. 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/GBCKK2367908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20350679674a07e0f055894f97d4d5d0d5ed58124d4510daea92fb207358785a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USSUB2357101.
The Age of Immunology (Expanded Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf358bf206e0eab1d8e71ba29bccc3f63a2d20f2368d245346e8169dcb77b5d. 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/GBM4B2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7151d31153dab64c75a8763e5b9e0674344c86cb0b80c147e82f5ea12ef51198. 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/GBUQH1500192.