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 0x0bef4b6591a082770883c3996e9d4c5d469df5f284b2df0437c944c104f7b69e. 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/28e21ab7-9734-45eb-a7f3-bd0f3ee93f2c.json and https://artists.proofprofile.net/proofs/artist/28e21ab7-9734-45eb-a7f3-bd0f3ee93f2c.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 0xdac7cef2fbd37edc418b5e6a78f661090db7053bf89223722dc700af795cd781. 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/USL4Q2298258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82499e76678f597962c721781b7c6f7b544d3f6b232d608b6c8aa398ee717f00. 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/USCGH2382981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df0036cd04f659a0c5018aa1164d8f6aa0769bbdc497e6f0cab7521a015f2a0. 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/USCGJ2377081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9e526f08d9af619683c7087ebc3dfb1eaaa7a4bef1e92691233de6eda5dbd4. 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/USHM82390603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc951a93fc2c61a070c64607d2f89887ea85e4fdb55d3095956e18399c63cc7ab. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USCGJ2461932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fffe8b2b2674c138a5606b241dac8c0f8f8bb2c30f203905051536a1ce370f. 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/USHM82491568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc8e58b487186c86ab28c220deee3de6b0a65c2a75c5c245e5b82a8b21d6820. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USL4R2489389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb76c0d8e81937ff81b4e0b19da405c65f9e90eb042fe28c1a1e877e91a67c7b2. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:50:55Z), 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/USL4R2496813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122b1aabb731f38781ebd0f2300c22b10fd2bd97c75c00b54394ec38a3434fec. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/USL4R2496827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8284c5aee034e17662596fcbdd09cc727bd1c1ff9c739d457caedb12797500ae. 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/QT3F22485870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a45608e5473ccc3a4924a511f4ce0035a03101ee40e9d0a43d489877d390a46. 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/USCGJ2515740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99852667d3ea6172519eae031db75a9d2e5aff7d52d78a18a316c594616b7a85. 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/QT3F22485869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8284c5aee034e17662596fcbdd09cc727bd1c1ff9c739d457caedb12797500ae. 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/QT3F22485870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33ff5cd6b9499887d56e673358c63bb793bab0b8accc0f9df1424362fe0a71ee. 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/QT3F22485871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891dfad26f4cd5019b52895aff8d43bc1285312f0cbc03a472b82bc4dc1c0f7b. 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/USCGH2517201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546ff835f9cd55d7f306e390d452094c2c2cccf856d8798f0e3aedea9e478089. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZTAZ2580701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317e72740adfb08f559191a88c1c59924b3fa88bf012b4ef1011eda5d36641c6. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USHM82569025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546ff835f9cd55d7f306e390d452094c2c2cccf856d8798f0e3aedea9e478089. 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/QZTAZ2580701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c2da6f1948033f1c93ad9e792978c6faf1b07ec28da3b40b0c347a6d7941e5. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZTAZ2580703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85456a338d646988f57a3471b01a2e6fe622eda0902746645e91d51b6c13765c. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:00:37Z), 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/QZTAZ2580707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3a54cb20c29b0a5f539dfa150dab8d7dbc3e6ada050bf3d0dd4dc11bd5dc8d. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZTAZ2580715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02e3c0221f6883f0eea16795f569917babe810f8e9ac57076d4b2b1210560e8. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTAZ2580702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c2da6f1948033f1c93ad9e792978c6faf1b07ec28da3b40b0c347a6d7941e5. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QZTAZ2580703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018e3a6fc4cfb0d2ee2266fcb78b09d3d5bea437aadcfd5554626b8ed7f3d11a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTAZ2580704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b28256e5270379a9387cf843246d4cdf564fd176aeba67e048389b367f84093. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZTAZ2580705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0e04f3a6144fb2fff7fe79aac683992f8a9ebe8fe59efd67d695d6f81029ba. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZTAZ2580708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879bdc4ed61bac7bdeae7a482c8aa786247dec8d057fc901a84f017c3e0362b7. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTAZ2580711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3a54cb20c29b0a5f539dfa150dab8d7dbc3e6ada050bf3d0dd4dc11bd5dc8d. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTAZ2580715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b623fb776a8028c0c4869f636e32a20bc090276c21c4e69f74fa8a0441a0ceb. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/USL4R2507479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08a3d54e2ca9358dc29e679ef1919997ee8dd791bc5b5cb25d9b8e21de5fe19. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USX9P2558436.