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 0xc41f3de238e6cc6853e038c9b586dd4f8053322a9566fcbc36c2f0f31ef10e77. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/746c7676-589f-437f-805a-f70d6d693b06.json and https://artists.proofprofile.net/proofs/artist/746c7676-589f-437f-805a-f70d6d693b06.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 0x64833c8bc3dcb6b279665c8aeb52d55db05e9d5ad9d01388b7fdbc62a5bff40f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAGO2216025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360ba1d5a231d184d6b6dd7132364ad2c84d9e9f88f15b864248ac93f07be0a2. 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/TCAGO2216100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33e0da91fe794b820ba1065e35be6b3d2af776a59a51ef4bc1dafb5469d3ad5. 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/TCAHA2308839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570173eda78f5253d3d93dfd49eba7b45358bc7c43a7f6ed7e59cfa63e32961c. 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/AUBEC2412666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d5eab1d95b47eb40862514368d5dd03122aab9ce8e6e9fde9dca7e47d3fa5d. 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/AUBEC2417248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57bace5eb878e54c766735ac267b528e951869af59b556feaf593ea8258c56c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USA2P2425013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c9047e0a1ec96baba3be4aecabf7ae95ec75a7ed6aeabc01150dffc171b476. 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/DGA062465518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28efbf6268d93d79a9cdfc16ed3374e0984869a5217c1d3e7add3d9ac330a74d. 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/DGA0Q2490014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2d92bc7a2fd9dc136964448086544ecc6de6d244f68bcec2ab4d40cb6a8b54. 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/DGA0Q2490016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2007cfd00d009ff6d50cdb949a5c7917c8c969200feb2c06b27c7f2e30f039e8. 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/DGA0Q2490017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1807afb17e094751b7d31f72168fe2c9df36864545ba6d9d9efdf2b0031c7b75. 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/DGA0Q2490019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfed1cc4b4540419ca60c2afbdc61e8894d5c6267cbf8f1c6e2fde59dbd85459c. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/DGA0Q2490020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ba04e24202b74950cdacb869a42cd93d94e5b6966b8fb8bc343487b22825e4. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DGA0Q2490021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435b824c11ee267ceb4cc283b7061a607e24a7241dddea48b338ee2d9ca01363. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DGA0Q2490022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73fb2d65395b9ae920f17446e35189ffb58322c3cd2cc1a58dcc316a64f8d4a5. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T06:48:31Z), 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/FR96X2545757.