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 0xe51cc290c06827797e9958f1b5947508193edc98dd061b0075e8b7aa526aac5b. 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/d383c89d-3c67-4a34-929b-1d8f69c48a22.json and https://artists.proofprofile.net/proofs/artist/d383c89d-3c67-4a34-929b-1d8f69c48a22.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 0x208bfd9ae845d35b9754068b0db975bf8f959e66c9d27b183997ffa8d79ee1f0. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZES71807324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9803ace21c3a3183d7fd4c0b62e8dbcfbfe3a571341ce24e1743232c813d38. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZES71807325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf79ef21ec848723d6e275583e2615dd2e4713397a4d5c45ae04edd117586d59. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZES71807326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3e1d01f802958154e7c29b69dca730b5126235d5e932049421a6ea2ffcce6d. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZES71807327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea6c25273c5fc908e1be1f25431d9079290b85cef6fc2e1c53de28baf99d076. 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/QZES71807329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12cd3b08cb98c8d4357b998de64300c8dfb1c4d2713669399f4ade162d3a9e4c. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZES71807330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56d8be943040bae5d571b097d44ef4bc3699749a11c6298667f9a9c1e7ff148. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZES71807332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52fafd83975f532273bfb45b305e825d6b720e39a50a29b0de48fa39212ccef. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZES71807333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9547f1311cb6d95d38a45ae9ef5295a8af8873671d77f66cb07947383c0494a4. 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/QZ4JJ1815792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54e7013ef097a94770218890902fc8c1d02ebc2b1b1ecc0388f71f135a71dcd0. 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/FRPZ92007090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14dc8298656fe99ee53d14b0706c6e7713563e479ef75f97b8edc2d1d30a4e2. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/FRPZ92007110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d7f9e393e6575d7e03192d85eb5156aaca2388880d96930f050cdfc6154aec. 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/FRPZ92007120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1646669b93b6ce2c4a3ebeedcdb474c95232fac941752c042bcd7a9ee6e3228e. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/FRPZ92007130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1baf6c589440b4383fd87169742c7e7b25a04b0270389917a19883b1ddeed90. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/FRPZ92007140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae5fc326ac6b591868069bd6b566bc4a8142f748360d6863dce002433cc27c6. 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/FRPZ92007150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648229da67d3901f377d79471ad18950332a5abf47c697c5c3d7fc69d722f7cb. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/FRPZ92007170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cfe29ba64309333168c0e8ce06a7c80c8b05a4b9bb7d3bd88484b4683b80465. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/FRPZ92007180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d95007103482c68be5d780c8878c47bdabda164eb03199c753c55c35f4fdb09. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR6F31920050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b1920bc7015531e1835aad9c449854d644096e5d4d3ec7c7359c76b224a214. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCADW1839007.