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 0x957a8281ebb1e1a697f7134d6681812d6ad4948cb119bb9d8d7f4c3f09b14dbe. 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/cd195c17-20f4-467f-8c34-7d7a8082a46e.json and https://artists.proofprofile.net/proofs/artist/cd195c17-20f4-467f-8c34-7d7a8082a46e.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 0x694e48fa929a59b896763e2b49a44650a222f73085ac4d896c6a0474bb8905e8. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/TCADL1894022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27338708a698d497652b677167bfc175ded0bde73fd421d40645f17984ec886d. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/TCADN1826850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e1cd606640c0339e2dfdb7e46ec4e1992a24886cc8c4dc59e562b3a88195ea. 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/TCADO1890453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa73ca4ace821425d1f3ecd53aac377b9d4173887d99c8077e2109cb6e4f7f967. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/TCADR1821909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb871d7ed07b529af2960c197ba45814d79d2f29fd77c3aef1a998051c9924ced. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCADT1837492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cccf400b51d9f3ac13bc7dff82951ef2e4533ef99de622b31cad41f9903016. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCADT1837494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a992066c0c95c7088ba7f6858eb3d1bd5b013cfc6791e984e09cc70dc5e4e3c. 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/TCADT1837499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468b82593d8c79437159dcdb28080e76694783be6c7d2f04462b75b9f6eefc9f. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/TCADT1837501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbd377cc9f7c963ee76faf80ef991c44783c3e39f59f553abba9f5149195698. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/TCADT1837509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624fca85c0e0c9706e93e13cefdedb7739c0b20f6311b741d5c0551ee9a6a4e0. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/TCADY1859128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a02988c74e1c257a6b54f068c5bb934e1a3b87c3dbe928fe894b617b07ce826. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCAER2012827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224b8f2f376ad92069f0d594a648446593c8911659064fa4f81084ef738df0a4. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/TCAER2012829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd709d32e124b14bd52be06ebe5fd744f30664ae94c53a0a31faf32c3380e9bfe. 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/TCAER2012834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad95a566e33b89199cb006709eb84a670c424baf4d5e876f77cc9066724eec2. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/TCAER2012837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55283a8367293fd3d38b2ad1eb9f4f79ba334ba741a2babc3db8e6f49bbef3df. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/TCAER2012839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2a6b4556d2d9ede677fee645ed0f06377a579265fe5c3d0c471fbf5ad6508a. 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/TCAFL2124128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393c1553dcb22b05dad3038b1072e6d45012fde5fc03eb0549122e0fff7e1fa8. 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/TCAFL2124027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecf0d13e6c43cac62bd3230f81d54300100ba4241dba8bd915fd74e843c8dbb. 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/TCAFL2124153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a8a79b8120786d00eca6582a7e7ed4d8208deeeca3f820384af4fd2ee9a703. 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/TCAFL2124159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0884219c550727fa3de5c174572bd8532e7cbe3c68096715ebf1d64790578835. 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/TCAFL2124162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e840951398c252bcef82eb7ad13643483ed11e57a7376f98d3bc839d84ff986. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TCAFT2132368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc3e81ac974097469797840bf6ffb64d3e39165a33d8ee5f22a79674c1b9b6d. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCAFX2183373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a61a3954f5e5bb3d7c6d5d04bda4a2c05326778be95c550d40eb675d8f0864. 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/TCAHY2489569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61665a497d060edb3f7beae1be48111065497425b6daba9ca409a5572f0db8e. 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/TCADZ1851571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf83d3378b40d79b94dfe1a1640b2d6021f3f1ea1799a6ba3d95a63129efd59f. 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/CAC0C2100634.