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 0x97c4b7647aea3e768b4d488300d8ae6bacd7f3eef1a932affa23a701a7232634. 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/72bcf7d2-47ee-444a-81d6-147fa097702e.json and https://artists.proofprofile.net/proofs/artist/72bcf7d2-47ee-444a-81d6-147fa097702e.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 0xb7ff2d486fb7fe4b9113f4b14e53a832d4bedd5d4f588441c387dda3c5c846fc. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/SE5BU2019689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b9c65f0e12816f904b4667603260e0f7a8958b2b5dad9c8a2ba7a1ab07895d. 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/GBSMU9250061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7dba9ba3641191a3c9e8aa842eb32a04234a7e0034ed1bc0d43ecc6207e0bc0. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZS662223797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10f9b9bcd3294395e340fc2a2144193de042256848924e6650bfe0e8c175ab3. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZS652288738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53dbea4775aa93d921bd81ca76d4906495b27843edfc1ab2b8f951bcc8f4b9c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZMHM2285367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074ceede2447ec5aa27270d1c8ba7738fe0deede76b42fe9d4088ebe70e92b1f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZS652201205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa10ab8f8dd728130aee2aa51d4130c6a20e1608546c367faf38b981d39997a. 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/NL5UZ2507155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1a52c6249cc658d2760105cb8c918f2501961ed8b3892e7d9e6d7848ac9cbe. 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/NL5UZ2507156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdac48c04e261391a9045a3c52a13e167b9f30ba476e8fede3903de948ebcf52. 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/NL5UZ2507157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaacdd78bb3563320d99ed01bb484449ffe3a08b86e6525e526a8cd737c74dd8. 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/NL5UZ2507158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff7ee84e76805607454d3814228835426181c47ef8a117b3d4f0da849899ade. 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/NL5UZ2507159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547d629d0b9afab244e4863ea9df3ac5eb09afdca99c81ca6148dc4354aff00c. 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/NL5UZ2507160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62a8b7b3328dc3192ca886172ff1a190e6401fd9587e5a2bac6a50590c2db64. 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/NL5UZ2507161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa88658619c004e396e015205208e837452f09d7351ea0b9ef4d0af4766b0f851. 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/NL5UZ2506818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcaec3a658c2de084c2b70744747a2be8901ce659fc53e667916891132e7e58a. 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/NL5UZ2506819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1304bcd2e7c7604149d4099e51cf5e88d1ae5b43cb48343966f75708f51a63b1. 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/NL5UZ2506820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf45adde9b67afc242fa5d22fbd7ab9150a3c1563f25f36443997f5e383af14a. 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/NL5UZ2506821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59de02e8f4ad0a9eee6ec918117649c819dc406f96fcfecf82dec9d3ead6f0b. 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/NL5UZ2506822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb02ccb727f9d2bf897a301991b2e3fe1983dd4a5eaca6933577dd0afcafa928. 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/NL5UZ2506823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad3556e3e7648a9bb01a3fc1b3f44a3d50f36e11c4fcbb0d235df9e1133bbc0. 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/NL5UZ2506824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5219d5e32fdd45fbfbf3b3b40eca5f0b010a161cd1ee95d01437564001b1354. 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/NL5UZ2506825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3fb2f6753dfae0d6013c985cb3a60b58ec7c0eefb3377c4de23b18a2e4efe1. 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/NL5UZ2506826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa1e378bcfe57bc3385e7df2f2346609afd30f40961220557a728312c186fd3. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/SE6I32105281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66bae19d925f9d6901d4c1ab8ba21daca006d39a7fa9ead479ba1e17eb297bba. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/SE5BU2074042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17548e6db6c601a844eab92f843dcad13ab142ce7e9910614b7b998396463295. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/SE6A92077644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195cb4f2056769ca4d079c951de57e2f870be51b99ff2b4e2cd1dd7745dc5bed. 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/TCAEM1993783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b7ffd8682d837edbda43145cd21cb4fc1f6c9c6a8f104b246c984b425d8fe8. 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/QZMHM2215926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd248bfd1a2b7834f45693c733790896228ec72ada555d52372ca192c618b8605. 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/SE6A92084088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d2b7c4dddd0060a05959c63cc77e1bb3bf92b9dcebaf7029c4582113e9dbcb. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/SE6HN2046810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565b22e348783db0b8b7585fdc4ab75d3ac57d5f6e7087d1d27b4d297f2bf2e7. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CA5KR2128584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511003a01117ee2d6566493e40b4fa3cc7bc9a43d168e4f917c097e1455cead1. 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/SE6HN2050293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcdc6fdb2af2aef4cfe89589bb93c1bb8c1ac44a9189a742046f00ce83eed83b. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/QZFZ62249744.