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 0x6c7aa696240ac51d589722e3da2909e9eb4dca9506e69d96ccc043c7d77313eb. 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/033e3535-b6be-4f98-af1c-c54ed25373db.json and https://artists.proofprofile.net/proofs/artist/033e3535-b6be-4f98-af1c-c54ed25373db.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 0xc16a0edd7a4aca67ed4d7f67124414d4e91b0e403848f1df04da15bd36dca8e8. 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/US3DF2509616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c056b12336bc04e8b1e5f0cf86e79be043056ab456057917f84561ea67882fd. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/US3DF2509617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bafdf2208d70766370a42d7e350612216d9b9fe785fd7e71abab9608c458ea9. 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/US3DF2509618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a8dec3498b96f9617f14c5a52c639af9b6dcb290c66893a7c11a47abbc5f21. 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/US3DF2509620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68d1a65d18b3e1b727683bc1768217aac24589d54096d0b5f0f0f5b8ef9dfa0. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/US3DF2509621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36f1ebc0af08d664abec10bdb7631a96a410826db5661b9121a857b6d2bbab1. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/US3DF2509626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d724de2b5402f499c831685fabee76a0b46775e7499005cad9dfac251c57fd. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/US3DF2509601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a4d50b6dabf3357d6ca3af7f084467cad82502f4363f1937b2a4ef5551cd4b. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/US3DF2509602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4881c33961b5e4df93c4f7546c4cd4b3bfb67c5f8307014fb02300bc7ff8c4a1. 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/US3DF2509606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7143365c0fa77509a5b24c7b5bb615004fe2953d36ef79eb8b6acd37100a1e8. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/US3DF2510843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35f1451973e89e9c01734720a07418d0851b6a07764618f136d2b7ace447662. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/US3DF2510844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c95e6cc295ba477584b83be156a37c40fbb4cafced5f1e51caf2ad46ebc7e5. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/US3DF2510847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0b4d5ea39d5b00d9fcd1c1763e88860a76b64a69f779c2c06eec9bedaaa88a. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/US3DF2510849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128575aece36a6d2a27669880ebbbc502f2ad8aa4c1132f3e5ca9c5e0a98dde0. 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/US3DF2510850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fbfacc3f6cb492881a25a4f8628e7d916067fb9d0c49553535aa16ea7640142. 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/US3DF2510851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49dcc18d14c0bf6e87fc1d65e7b47214317cd695e2b68b2cec4960b4c3aaa9fa. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/US3DF2515138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7adcd51f00f47f8046603ba5a71ce88664206f0f3f23b762847817a298dd9291. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/US3DF2515131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34e48ac8ce388464e320053df9ab4571b49fb105187b5a7e08034a197edcff2. 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/US3DF2515133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaabb4fa27d2c5d2d3decf277c22523889e8f9c290501c707712e5bc1feb77ffd. 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/US3DF2515132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6e67bf7d84642da0fd7646af592d4735034423303b925d5c10e99949b3eb93. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/US3DF2515130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dba4d2983cf90a732ea60d21c7512bdb5dee36549ba683a95f63277ac6244b2. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/US3DF2515135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d6b50f8a30fd4c9d7e7d62429add3967049e94dbdbd6019a292240ef0f843b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/US3DF2515139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996f4af1f7f8251bef10edcd0b0156815dcb274f111fbdb2b93c6d8b9402d4d3. 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/US3DF2515134.