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 0xf49291aa163b2253c20681027130b81aa0a4fc06ad7bb530a690977bcfa81394. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5510d6e4-3625-4cae-8175-e0c17c150d23.json and https://artists.proofprofile.net/proofs/artist/5510d6e4-3625-4cae-8175-e0c17c150d23.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 0x7e6527504069b9cca2be2fbeb57f1b7f4328e9b51e9a46f751179216cf7d818b. 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/CAGOO2013798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e13e1ac856c3f3cc3f978ab2d56f7f56cf1f1df525205574b614913a9cfd68. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CAGOO2013808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a5c18cd23ba23b2bbc7e2f5e713a6f0906d4175f630f2c59ee18a8da790c72. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/CAGOO2013816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff29d34bc647a0f5f6032602004be1bb6a6645f35299116d600c8bd3b6669f52. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/CAGOO2013818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe12a9fb6a4d56bbe6562461507d3c0d13afadbf80b8631a57efd956134bafde. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/CAGOO2013829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bca0db506f4695db5de3b22de34bf913763ebd6344c6c91bea305faf5983278. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/CAGOO2013827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d02bde34469a861166fa1273335f473bf79456b7523223d1f3db66ddb86a1b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CAGOO2013835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3f714440816330a2e02df02641173b0cf6673bedb67a3d0db9ed77b22575c7. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/CAGOO2013851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfefec72f4df272a96b43c857498740fc9439177e9b88a810583bcd158b5bd209. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CAGOO2013846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a63d286e73ddb14da31e64ebac0e3f45330da3793846d97bad79f3c9a7045c. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/CAGOO2013856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6f7987b861d73766420a1c0f8eb525177de9e1c9caceca1065bd72db5329de. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/CAGOO2013857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823bbfef35341a72f2ef24cbc4e9bfcd2e384148bdceeb4cce6f5d16769e7f41. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/CAGOO2013859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8f05740cabac69bc1529515627b585f972309f3b39730519d3f7ad6e3170ee. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/CAGOO2013862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1313cc03c682f3177c6dc09500bff1bae0a35e3d781f5b30c34049eb1d8c6918. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/CAGOO2013865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaaf1f1aa5b5c2240197c4bb837311ab9eb190bb57df615bcdf2cd0d3f4bdddf. 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/CBB7W2311784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0769d14d536a8b2615a84b0790f20b5a08b93569978eba4b01cc46fd9c8283dd. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CBB7W2311787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42863ce46eb18a951c67b4ce5221b8c19132bbda5314e326e6d8e6fb282c7536. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/CBB7W2311789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad71a7d0f066c2885ba9a0a3c68c4b48597c292e50c39b858510d51eeff9620b. 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/CBB7W2311791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fee99507c14dae0e04fc163303ef5e5e08821be45beb8f31bb6846baad4f6a. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/CBB7W2311794.