In Greek mythology, Antigone ( ; ) was a Theban princess and a character in several ancient Greek tragedies. She was the daughter of Oedipus, king of Thebes; her mother/grandmother was either Jocasta
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 0x2257c6da5b6d744d95bcba135e734d92b54406834d7cc467b0e94f60709fea15. 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/f973a74b-5fa7-46fb-b550-cc4bbdc24c4a.json and https://artists.proofprofile.net/proofs/artist/f973a74b-5fa7-46fb-b550-cc4bbdc24c4a.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 0x91c1e1f39db9ee69d47de27d0c2b49e75a46885a9fd8d5a4fa5d0f5f4a6b1715. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/FR9W11323036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b06ea2ade52019f558889eb31d3b6cdc89bfcc42cc89ef0365f1e36b6bd6a50. 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/FR9W11627571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2f0210d67cd39f923c2f31d4eef2f3cb0406542328e6af1c0f73cc4d277086. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/FR9W11709032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a52b70ffd30f6f5d53e194f0f39ee09728274d8c3073e4df6b012906aaae745. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T15:22:50Z), 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/BEN581700270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972e0bcfc273471000a34e967797f90dd52827089818d65f07890ba696db7ba3. 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/DEYS32000301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7405bbcb5399fc23b436f0e8c3d8302449edc22a73391f9911956280a064fdfd. 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/QMDA72157235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe69caee13497953f474b7a05c2ca35ff6e01705fe2c7dfa999d3a0fb031f785. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:18:04Z), 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/FRX872133845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e33e8ce1ed435f0cc32e6d312009782ab9f93777823f8528432ebee2c38af29. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/FRDX62209470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e33e8ce1ed435f0cc32e6d312009782ab9f93777823f8528432ebee2c38af29. 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/FRDX62209470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfd19c073fa0d65a650097e539006b69a373a62ef2b220df1a665295cfde634. 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/FRDX62209480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebfca1808dafc57b8ba7edeceb45fcc363614faece92cfa412fc139160afbf6. 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/NLUN71200106.