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 0x58518b9b0569ad58cc466d2e9cf8ab94caf544dc56c16c901ca333f60faa3bad. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc2ab40c-7168-4927-b590-c85c90dcce6b.json and https://artists.proofprofile.net/proofs/artist/cc2ab40c-7168-4927-b590-c85c90dcce6b.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 0x2974a557fc2dbfe01df97ed76c58faba1bc5520f9080cd62fdb2268dadb70bd7. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/DKJG51700901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08032306c3b8af3a0c4215e23a01be5dd714767648d3036a40ef63c5f66f3dcb. 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/DKDH70900112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c07fb36941b28385a3f9d3a1fd62f3000ca95c2b39ac82ecdc5519a1b923767. 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/DKDH70900121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ecf8bdd0632a94244a335d58128b35eb7fc583eb8ed2ffdd4b401ee91377fac. 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/DK38A0600102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c972c550c10b4ff845f8b08d56876a715c6a62ec2e31a9bba602f59ee219f80. 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/DKDH70600107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c937240b71e7ce869158b237b3470289278158de9dc2c878f9de3cd00fac14. 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/DKDH70600108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272f2b982b637fabe0ca5475048327b79cb1d590f71491fbc32cb54d192912a9. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DKDH70600109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827d418177b9b9f85e1c0e86d6ef16905f79b3ba60b053ce4730ce3574391f3b. 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/DK38A0600101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bf17db4abfeefef254a3204f97b7ec44ef4392dfe1207d5d6a9efcf85e9e1b. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DKDH70600111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7877af84ff472593e2c59358a4e0e54d3549209d0419d7f210785dddf6167eb2. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/DKDH70600110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6926208d2cca5e37fa75478020b0b114c87ffed7f4729f816a792e78e7778f1. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DK7V11800202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69fef52a8d545fcc44b1fc735d4b0701d6fdbdc2b8dbcb727f8a0a34fda9b97. 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/DK7V11800206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a38f2970ffe0788e698ef7967470a21fdc8bdfb7b41b0be59c9513fc394433c. 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/DK7V11800209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c580a655ab5115f776ec08202ef45078cc364d95d8ff0e807fbd04ed203dba. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DK7V11800212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd1ef513017673e5f7989247ebd4cc86d3f62c354016403d94cbfabf5774a22. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DKKM61100205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c94869d57ed26b34767f79f78532901c08b8de17b96c3dfd10dcad492d2bbe2. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/DKBR21202122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c0e9b6a1281ad441fc078704ead898e305da083b7e4468b2fa53105862c7de. 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/DKS381900305.