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 0xa8f6a9886a217f4556780aff5164d1a7a179fddbcbfb7c3d4901ef6dad815a4e. 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/35443960-0610-44de-a6e5-1311ca2e8918.json and https://artists.proofprofile.net/proofs/artist/35443960-0610-44de-a6e5-1311ca2e8918.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 0xc8bb02c2c4cdddbf349523f8c7278dfc098ee22213a682ee6b5cf651fe61ce27. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DEQ022013114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee27d3a5ae5b1d41d37934ca7d2d6724609122158041c199fbb228b1846ec0c. 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/DEQ022110374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7183edd95de4026bdc93dc349ed5ac8bd39252662c79f07e8afa606d7b89fb9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEQ022105640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e9bbad85b67debd55f26a395aeed6c65fb63d72caf9cebd47da12b4d43ddd5. 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/DEQ022105641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6d6f6e8d6659d89524beca670891424aa0cd46eb8836b7e4c3f325ced43985. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DEQ022105642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec651f6c2cf34c071d93f9509589c548dad865ae22c7627896014d7ff341f52. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DEQ022290633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dca576dec9ea2a8a4b1cb6ff58234a2dfef7e2470111f6249e3e5f583a8772e. 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/DEQ022290637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2fbe0ef12909668981d1f943e76c6d7e9798a6c68506176c9137a9450333d3. 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/DEQ022290638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32bbd93500e3637313d55912907b4fdcd274189e95cc3cbe308602730f0d8546. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/DEQ022290639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da0b601bc06a801571b8991ea14ecb26c7bf849e3c3a27fc50c68f0780f8b64. 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/DEQ022290641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49c90ec76ef03735285de39aa9f4f40f3d3b307c18d3e71fd7962d378e4df9a. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/DEQ022290642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ba5d9b9618ddafed550ac708d5e226de1c2eff35e2c72303c288448928f201. 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/DEQ022290645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f13e0a40cccb112ed218c3df799383eab2d2d585bc5f812886f0bce85268b47. 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/QM3DF2212179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7802f6574b8bff678a21a9a66d97afd51eb0c49c297de9ba5bb0ce729248bb0. 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/QMANG2227841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fc3c739d8c98206de1857fedb4dc7d4dde17da59c657b0b1f0eaf1b5079a73. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/DEH742417986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91972134f809d4071b4aa897d3edcc8ff89b541a89544c1a441d2cb0fb33d64. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/DEH742419952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970fce37e79f774a27ee03127026313903d33a271c2c8684d3ed751d265952a7. 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/DEH742419954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x056daf999997b32d819b8f2269bddba345874f9f63f5a7825809a2d6184c380e. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/US3DF2594337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c745cbc79813deaf2821f7627c8b2db7c45e6f519fead9e05f9e9784963115e. 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/US3DF2594323.