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 0xa6d376fe7f119c6b52f615d83eeb3051f607f5fdf3b153c62e55aa895e66b678. 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/3b247d35-c818-4e59-95f4-0ebd9f6bd499.json and https://artists.proofprofile.net/proofs/artist/3b247d35-c818-4e59-95f4-0ebd9f6bd499.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 0x271672ab120cfc46a9b8edb8a3bb53c156a33c56d85232c05f7cd201b32c0c4c. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CNUM72300257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495c9941171b2bfb836f2baa41661674ab55c761c49fd42103234213622b761b. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/CNUM72300259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36106930dd019be59f1c90df58bafd72e3b67ac53f0473ee02d27e29ac5d0f29. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/CNUM72300261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a687d3c4582a6fbb0a1fab10cd84222dded57deb9a91596b65cc65176bcbfcd. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/CNUM72300262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab1a0fdd80352c2874ba5a4aa4ad629f1b71c821b1c6fee773d83bc13c203b9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CNUM72300263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bbf456d8427d62838b72e7d9faf693a2d6b415e95f394eae353578172aa8a4f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CNUM72300264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2deec3c5cb6c6148e935722f8c0844ec37e9b991b055ff8496d480d3d67dee0. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/DGA0L2422293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e800a7e116fe5b83413610717a6dfe30c078fa1d2ada9a0bf391f1694d93a86. 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/DGA0L2422295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6dd70608df670a9b9e6bb2f02e418b0fa53fa8b0d3071f3ed5cfe77eb64b877. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/DGA0L2422296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515b4908659479febd001bb8b398289ec1142e2cfe5e0d186e0374fe84ea4be5. 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/DGA0L2422297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca79bfe9b9b62fe4c4edd334e2f977b133e1f7367f65ac69805650c09af361a1. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/DGA0L2422298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607ae6f8950d1bd27ed533a0c470f6755fe4407d8ba6095cf6f724a33d893669. 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/DGA0L2422299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975487ba273c46c521ca9267fabcf637241cb0b3f8b66a34935e9a787c6b159f. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:31:54Z), 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/DGA0L2422300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95cb29819bed7cddfcae6c67a4af186b31fcb2c019d4180c56726bf333a4b54. 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/QZJPM2479842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2c9c4e0d18dca14a2770a6c02441f3a718d709c2ae42db3466a6b9d7727d88. 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/QZJPM2479849.