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 0x96673aa25bd47f20558845ef9303cb5d8845739ca5b5e58c51824aaa1fe0946b. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bc92f70a-22f5-4775-9390-299e4d028835.json and https://artists.proofprofile.net/proofs/artist/bc92f70a-22f5-4775-9390-299e4d028835.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 0xf3db4914260326f21b2afc8197e70129efd8de236cc0f63db4d02f1edbd310a6. 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/FRUM72001419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78229374108553e257137f23fc6375bd3869c957053087fcd39875e8b368a6bc. 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/FRUM72001621.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce844351a5b1eb7c62b14d347852cdb1eca929d78bd3aca659aff55a0dc112c. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/FRUM72001732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923e50046c135ef70bbcc1fa79c468c11e8d3b12ce404d687c6a1169cde590d0. 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/FRUM72100039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24401f674352519bbb8b7be711aeef8af0c5d681b3fc845cfcceefd63ef67df1. 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/FRUM72100052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447d784b64936dbf5045bfe9b9abee6f89bc6a2e2e0f16c40e96702ef6caab48. 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/FRUM72100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8923b3f26a7e3ff5ff2273c8a9312892a51267f79aacb07905019458011b14e9. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/FRUM72100054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c34747ceffe2d56e96410fa2e09cad32750ad5505dc8158f82c366ad4b4132. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/FRUM72100297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820b473c6cf9fef88c07b1e1192a93a0d71417dc8185ba8aa4a8bc4b5d1a0ee6. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/FRUM72100299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303c3ad259caefeefaf31214913746f413816f7a736da6fde274647e524ca409. 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/FRUM72100471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a4740fd8581a80a8593b5de987004affe35791eb9a18d5b32042b9c7c3b7df. 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/FRUM72100687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80173d1ee877fc94481e11fb6fb987d2794a1442f92de4dd376e8053f3e2dd11. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FRUM72101919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942b625479ec11b76cef3bcd94a5fe9f02328f3d94234b66a7f67b98037c808b. 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/FRUM72102458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33aab05678d735fb3d0083939cfe8afb830d90df7200295fa08a8d4c46465c80. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/FRUM72102482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797c99d60f37ce5dad5a3a3124c041ff4b4ca3415e02f96909c8e9509ff320d7. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/FRUM72101921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75239952f1250ed6b76ac81c4734a772e734f9f02472d32db3334a9c8ad4bea3. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/FRUM72102459.