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 0x27ee06bd791417189e68b803a20ed6ba06577ee8a018d40669616487ecec6384. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/edf25ce4-0e62-4a15-a899-3edf1d51d4ae.json and https://artists.proofprofile.net/proofs/artist/edf25ce4-0e62-4a15-a899-3edf1d51d4ae.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 0x09d7ca4baab1fe1e16b283295aa8cd5662f74c94c64dc4554af3239afa68b7e5. 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/QZZ8A2578903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be654c49c62116bfed8fd781aaf90895ac0c582eff9dfac1a0e2631648fb16c. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZZ8A2579270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c149ab4e328a41e7662da16c16d7ef0420621f64e06200b744b21eb425242e1. 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/QZZ8A2578849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1329d112de89b1195a0d2f1da155f9cc4d05ec5bd542fa8f020a17761d46c27b. 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/QZZ8A2579260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e47c6df2c51049dc9ccec7ff653920ffebd5d4cf5ac97eaa2fcd78f1667f156. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ8A2578824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7de4742394455bb6a319f691488d4950cc889c33f4f14e54781db76bdc25fe7. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZZ8A2578894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1477026e1e043258dcec2b6a871d8e8810e52593d47a3f605e1cdf1985f69ed3. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZZ8A2579292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa072bd1dccb5712d9a272f7a37b1ef65e16eac32b1354971036878876d7d560. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ8A2578950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820512cb9fc09a414e206fd14a1d6ad416e2cfb245626b670ac5531592e68038. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ8A2579275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86277b687b7fa28f690c873faf3c963ab13025ee3b8e8b9f4c69c3c0f85d3961. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZZ8A2578855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc8b7a17cbc1e427791c041be6e682190c20e0c0669529f26f7e85cb1b65cf0. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ8A2579942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb9500cec91b2adcaf951dc3fdf8c2724a241667d1b4dba67c2246d918019b3. 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/QZZ8A2595752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb6e3d77edd07d90f8faa69861586624b65a4eabd1252ceeb34792b2e024c9d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZZ8A2595746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddfb908898731e536d9791a3f894553ed213fa237b4eb00a76852b28f70e9a1d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ8A2595755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b351457a4596b1fb0994083270dddc1526e23bd426b63a0f593d12ae5e2070. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ8A2595744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b0bf1b5e6558c8705344cc8eb86c9de883f54c1523994c91e9e347cc5db4e0. 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/QZZ8B2500185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24af78d2bca54150c7ce8692a72002245b2e0848d6c01f69dbc1cce252f7d05a. 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/QZZ8B2500191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d7fb67d13d1868ef39e8e605f28d9820e2756d3622ecf48f6733767ab5058aa. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ8B2500189.