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 0xa6df5bc207f13ae7366eb726a6ec02721815b7e4f5ba6532b2ce64b14c5958e5. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/54301697-1af5-4777-8efb-a2b2f9a775fe.json and https://artists.proofprofile.net/proofs/artist/54301697-1af5-4777-8efb-a2b2f9a775fe.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 0x052195728cd12c3bca6a9683152b191f5ca57d731eceb57e1a8a52b8e0d660f7. 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/USHM21693453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b14b59f0733da0289bd6f5e67c48e78258573880560a5628379d350cc25894. 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/USHM21693454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7237c9d531c4fbbd8deb0ef7d0056414bf2c4f7e97ba9f5f0eef4b4fd39ad13f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USHM21693455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8a230a42a982d3116b8d1d4d769cddb5947f63b3083453423827867cce2728. 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/USHM21693456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75bde4d14783f43df87f9911529fa8dc954540f718c49c93722a84fca8f264ab. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/USHM21693457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd53dc1be368a0411cda13c5b94d8ee900248c54c3b68034b36bc0cc1b9bdb8b. 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/USHM21693458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef9e6144c2663bfecb8fade4be9fffe8005cef47c9d3e30c5724172598c26cb. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/USHM21693459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a30a44f8a67e257aadd118acf2a8e5ffce597dca5c8e5bbb30536daec7ebfb4. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/USHM21693460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535e33089a7ca7e80e053b338b24e39cf5bf84624e6a0c272410d7e656a06177. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USHM21693461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6732d6854dc3f3583f0669e171521ef611806c59885ea4e029b42083d5878df. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/USHM21693462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0fda4b8c9a8416ffe0e0407b5c696c0bc9caf9e8a103f54993a32a5b6bf159. 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/USHM21783412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf21b8ee387752d36df450c1fc7ebbc3364b676b3a53a45e638b9d9a551accf9. 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/USHM21783413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d8ee37ea6f878e7e4a2d6241275833f28938551b4a83ec01adb73f62175726. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USHM21783414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42dcf20fc9ec438909d45d7d648fd1349c0d40ed829b86c0e54048a2133322f. 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/USHM21783415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0b577d59e0a1138eadbc77107417682ad34e8c94294a7aa6534f39bbf80b99. 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/USHM21783416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a2dd7edc9f8a18374610b9728ff4e61d24de7fb968c8339170d621e672c3d2. 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/USHM21783417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5c7e5eb215844ad28377c9eec81287e02613ea84c9a608aa5e7b5c880b43ab. 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/USHM21783418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661114cd68242ce3ba6c269c82d1bf815f744a47106d5ed54fb9272431f124c8. 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/USHM21783419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c4fb677f0809b70ca29213786406a44c4591e3335dcb202034b873cfa9ce90. 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/USHM21783420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aedf2468b675de5dd5daf572a1a210f4209755d9c9f56443e43232dcd34016e. 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/USHM21783421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf92197fb713ca44b5ecf0363a0d4a7ff03479cefa1b95baf51140bd29951cc. 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/USHM21783422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5ec9bfbe5294006bf60e7e48bfc0b77db8cc3f9f86cb54c384fc68e4817f7c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USL4Q1850041.