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 0x2ae7c8123580b4820cfb0af4e0e9045937989939cdc777760f35512725c94d52. 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/644bfaf9-262b-4f80-8d5f-cb7873ab563f.json and https://artists.proofprofile.net/proofs/artist/644bfaf9-262b-4f80-8d5f-cb7873ab563f.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 0x40968542996ecc9df3038c4ed9605f5597cd8d81d33fdb86b69380f9cc34dee8. 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/QZ4JJ1861329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0459a6b57894e3ed740b1208a369360bc1bd2410a69901c1c511698f8a432bd. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/QZFZ21901235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0459a6b57894e3ed740b1208a369360bc1bd2410a69901c1c511698f8a432bd. 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/QZFZ21901235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa1f0978e439db34c98cd544b9b30771939ec953895e9cf512e5b38644df1bb. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZHNA1958256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19dc2752c0819d8b9c7089e44b149aa339f812782ac08e1ba30b8254214a215a. 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/QZHNA1958257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3ce16e613714c2247d111ef132df26894da527b557e39092515057bdbdf0b7. 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/QZHNA1958258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720d5f17ad91958f76145766971698fcc587ac9a5159ef85976c11b07771371a. 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/QZHNA1958259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df21bf32975cf75bedc7a7a781ca1ab9bf0def7d0c7a5abc3c2f17abd86bb4c. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZHNA1958260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8626aaceac5644b515add4fa67a6b6c44168952a0420d95918d92f776f0fa3. 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/QZFZ32093159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e429930f3979d57d49fac81481734089fe061a106e4d8842352c6736f672ca5. 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/QZDA42037967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee70565bc17c388b2365579f8ffb56991e4e7f89bdd9b855f5bccc07ca295057. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZHNA2086937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0571af96e54f4edd1116648a6faabca14285f09a69d2bc7bb3a85047402350d. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZMHK2024172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f398cd41c0bd56bde4c751b3439b9b2ce61dd6c52f2fd9dddae76ea00219c3. 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/QZNWV2073843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad79b13c2a4e0630176ec584a7f1137e59790677f57c98ddaa4abdc984e0241a. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZNWY2181443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ece1cddd18543c54232157ba314c7bf5c4ee0d5ad8f40cc52a30b02558d93a3. 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/QZES52268900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe941c012ab6b8f5af21e04a5965f3b043cff570a84f8c78d0c5ba7b1db9c622. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZHNA2291139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e7180c6a705da2de44f58044b6e10b861080e7cd7c6b53be51f2c4917f3677. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZK6J2295978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a9b9ebb89a0cb52d502b904510105968d3ac6e0eebfed27d245b82bdc34eda. 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/QZNWW2285336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71919d11fcda15277e9a6927a671184908e8d1f5ae0fbd1023f473ee5386af88. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZTBB2267554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4322624b3fb93985b05d21671643994b9da579bd687425379f62c261d26972e. 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/QZK6P2367214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db57b5080c667bf6cd84b7da08a9bd77f99086980afc4111a7038f6c22953c1. 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/QZNWV2355195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x741b3404ffd45905f6753e5059ddabb8685f6dd73d6b52ae2149d2604ac1a4b3. 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/QZES82472125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x741b3404ffd45905f6753e5059ddabb8685f6dd73d6b52ae2149d2604ac1a4b3. 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/QZES82472125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db57b5080c667bf6cd84b7da08a9bd77f99086980afc4111a7038f6c22953c1. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZNWV2355195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4322624b3fb93985b05d21671643994b9da579bd687425379f62c261d26972e. 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/QZK6P2367214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46b65c13b76865164379a3408426baceba374a65619d623eda6b8b13a55af98. 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/ITB002000569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd69cea48544ba98daf4b71a0fb41c4a950e956ff85422d5d9d1ea5e8b919ff. 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/ITB002000593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46b65c13b76865164379a3408426baceba374a65619d623eda6b8b13a55af98. 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/ITB002000569.