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 0x7a90d89fd5191fbd80a080b1d3a6cd52cef43b43dff5064e24137511c5e73395. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de8c3f0b-8948-4edf-a424-9b05911952da.json and https://artists.proofprofile.net/proofs/artist/de8c3f0b-8948-4edf-a424-9b05911952da.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 0x3de2f7d77d6ab5570cb7ef77e251ea81662cbb308671531aa62f1d345f210b51. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCAJN2565408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d5b719b006f8abcfb8ca38790b1f0cf0de5f7dfee7ba537c3461ec959cf27f. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TCAJY2597877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f498e1ef6ea7f3fcbb15bec4d5d5a6ac33dfab098a540aea0f14b5d3f5ac8ae. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T20:38:50Z), 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/TCAKA2569932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a33684de446ca99cf42b15dc2674a61dd393acd9697338b46aa622b7803ff6. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QT65W2570853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7708bebbd407e3398ca9cf6a4e281b9bc7798e088650e1a3d2fc48cd1abd5931. 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/QT65W2567729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa9333918f4189034f26a70245baac5a513dfac64afc82b2f9a43ca7c3e1a40. 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/QT65W2571247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cd89ee3522322ea075558162bfe9866a696c36fe788316a7ce96ce343c9f74. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QT65W2570827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9e53b751d01bb1a5243378c83eb690f922d35d28950aee271ef406c0993257. 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/QT65W2571198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf998436292730620523a313dcb1e40783d1d1af76b9e52d8194683a9228787b4. 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/QT65W2571004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b06a06c9bca88d97aa92339c96f17279c543ce3ffc231d3b3aa952d763cc5c. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QT65W2570944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad51b1c141662bfa7c77dbe77bf4c7597f11f444480b71a0fe6e2e22a2163ae. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT65W2571033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6291dbcdb2fade0c5300c93d83e1a8a3cea63a4205d04af50b9d193ee649595c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT65W2570745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30cf350f13b0f5bcd064a148b8f4fbc17f5c94ad796c4246fe4f7f9bc5bb2930. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/QT65W2571167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff065dfe87f9a304faf0a0e2d26fd0407bd8dde2d2b758dacbfe2b0a3d9facf0. 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/QT65W2599692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0678498887b99b6af44c6cec8a85392cca894a15e6910335062efd9a5196f537. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QT65W2599651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72eb7a299fff91e3664a8d177e0feb4e46df7cb6e238973d6d0d91c645c54209. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QT65W2599544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1874c35de203c79f74e84a9858ed870d77de0cb2508f2cf85f37dc23716424fa. 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/QT65W2599621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661c747429949305dc1fba4b7633e9f4a90de3dbe5eeaf7ae3b95a8fac93034f. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT65W2599578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc7962b6fd6a31370ed5be363526736d45fd25113d2f3f2703851de8b17b133. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QT65X2535944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d7bbc06da4d637c6829b259935f2dfd901da8e968d72068c5f38d9d0621e3d. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QT65X2536058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f61cea47526c2a5cbd3c03e2d6ebcd69cc7a94c77d538a6ad30ac511d3ec0f8. 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/QT65X2535968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1738e0d1555c2eca99ab5f714f045225581786cee32fa43e1aed3c0880b921. 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/QT65X2536281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e8fb88cdaf716cb8597fd7ab17386e89618c762cab4a0ca0d0676cbf5d09a7. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QT65X2536330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa340621cbdbbbf5ce7732ef975b268791a6d2e981658badc8b2529998eddd145. 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/QT65X2536206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2baf6ced2cf9c8aee636aaa3629df5c604f85f59adbaf3a69cc50545e83e6c40. 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/QT65X2536234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9861df47602352ca197a52b67f50aeb9660b2d4c9f169903eb2cb741aec091. 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/QT65X2536010.