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 0x1902e6f05cf2e5310529bfcef4d245e94b8435768ca60147f7b3132f718b2a1c. 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/056d8e79-9f21-49ca-97ea-74a5f6f86baa.json and https://artists.proofprofile.net/proofs/artist/056d8e79-9f21-49ca-97ea-74a5f6f86baa.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 0x0776e8d23712e1d9fd627f14e9f8a7dfecbf035579efabcafc3e3079595ec0bc. 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/QM6MZ2012844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab5e99571efe2c470b7d8be139752b9e1aecedc8640c4473d461c3d90404b1a1. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/QM6MZ2012887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe930aec300cbd4bea59a125592d945cbc210ac5eb71f8383edc5751f7538407f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QM6MZ2012882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f985758b2f26cdb034f2514df21fad7162959c4ad98a36f6f6f7414a6c3c20. 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/QM6MZ2012871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9191395a7f7f2506648582e6d4049f67b1e4eb9b91b71606120ec0b195681072. 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/QM6MZ2012851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548f3eed32f55cf7ef9be8ed91e8d7b068a018e85790f9c57c64c25c59ab3eec. 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/QM6MZ2012092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3064cec5c9e4461caa982405606b525eecad1326d608c114bf782e944dc536. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QM6MZ2012096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae072bcdddaeddd06f6442f148e30ad44072dcd2b4424b445809e4384e10458a. 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/QM6MZ2012845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ac0f9da1482980b36eb0d41f3c73de3134fcf82bf1591b16bb162ef28e00ee. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QM6MZ2091038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72021c856ced76425b21793366d710150f8938c816bde1d1d8ab65cf41c25ac. 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/GRSTY2200687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841ddf9416d0d6cbf0ada4902e4cf28fe3737e68cadd9a315b02575873a184b8. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/GRSTY2203293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f28dbeee43743ff1d059039a1ee5917ac53516157a8d6b4fe4b86b28022abf. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/GRSTY2300273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1b49fc4fccf1521174ae9c342b882c59f7782817de547fc926e4c42b6bf893. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/GRSTY2300275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595c36ef628a4e0e64485815b7f664140ab8117af14b1ad0c4c66912d59cf518. 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/GRSTY2300276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298cfe34431a90e3504392dd32e195e4bd60e0e61928ee72d4bfe9b65b5bbf6a. 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/GRSTY2203579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ed152e57e3ada1fcd7b6d0aca3f0287b0129a24434608fec208023c3afb142. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/GRSTY2301334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bcbda29b8f1db27a22974408682d5daf0e81f1aa2c0b1527533077b76e98dbf. 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/GRSTY2301336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f4f59a745d5b10a769519bd10183398c23418631f63cdd8e9d4756852c22f6. 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/GRSTY2301338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890933f7ee76a1b72f4f49c03af1ccc47b39c56cae3f7f46040525684c434e8c. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/GRSTY2301340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcd53a505fa86edb847dcc1a97d4671a2d11e5c013b79af0e76312964bb6fe2. 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/GRSTY2402892.