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 0x1f8a52d41a173acc19529a6e6defdba08ac2d8d9dc970970512f11717de12e5e. 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/15f1921c-6ec8-4814-9a71-d63d3be3593b.json and https://artists.proofprofile.net/proofs/artist/15f1921c-6ec8-4814-9a71-d63d3be3593b.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 0x9cea521b6d68c9819c1b7c0c306f4f0cda5332ca16b46a7e84015a5d0ef04726. 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/USX9P1307818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3969a0c18b48efa906ab9cafb91a7758c1db0d7deab546da8ea3a3afbe4c9f. 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/USX9P1307820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417988f867b05e57607f3187cecbf3e16ef40420756385be21c95b27ccf1e49c. 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/USX9P1307824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f971e5199018b7d5cee0cfb1d7075fa7ca16f2d782c1937fe32f53b6e94bb7. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USX9P1307832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d723136180308a127c218435b3298893674e04a42e9e80fb366fcc88fa85c81. 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/USDY41675555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce1870058944c6b192a7a5df6b1c4723e532e54f5daa769979890d3986488c6. 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/USHM81878485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e14e891297ac4fcbfff4a05f0e61aeb2ff507530037f0aed4322d4a4a4c547. 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/USHM81878486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475ea55c3a65facd25f2878e5c16de3461887d10a63dde2f76f6b5c8b2d862c9. 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/USHM81878490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83545d033d44d363d81f45a3d7b4fcd5a4cd2d97eda94b45b07d7119fbdd7bf5. 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/USHM81878491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608e38c1796172cfa61adaf5fc42e8bbf83576edbcd8699bf2931f4dd1510efe. 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/USHM81878492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693aa532ff9cdbeaae0f73464dcfe1d3a8a371fc693c44ed562432ec08543f3d. 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/USCGJ2066693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa402f0f5685e5fbac30eab86ee1dcdf007a934a2cc317b7d4701d534cc023d48. 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/USL4R2328669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae34400243697deea4b9cd458d0dfa005c90faab41ab961aebb5f13daa50aae0. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/USL4R2328670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369672a59b87a2330aa528ef14cc153c4ff96e0c89083e6838cee765b5428578. 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/USL4R2328673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acebe8287a067a4b8040e0cf941f93ac3a3bc83b23b53f238fce1a4c8080a81. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/USL4R2328675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88855dcc45af08afcc1975df0068522e92600a354ebae35d2f58276c7feb7fe7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USL4R2328677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa9bf225f56c1753027df540a972ac50161bf0cab800d32c2bb7fa30f6a12b9. 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/USL4R2328679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2bf3a7c26537f912f49a8e61878142a53b66738a2f65e7054d9e7beeaf8b96. 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/USCGJ2568467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7297070c5bbc4de353060239d0f5614e7abe9b4354bf98a9a53d09ae6d726902. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/USDY42518081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7588535593d270ab65b3c69e2d328ec8bd0338c1400c528cac1dfe4f34ad4bac. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USDY42556795.