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 0xba3f40e376543c2f543ff22b50dfe290285ef953a508c8326221d4cc157a4d93. 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/23f291df-ab19-4282-9471-acdc2b4ef0a3.json and https://artists.proofprofile.net/proofs/artist/23f291df-ab19-4282-9471-acdc2b4ef0a3.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 0x72265107ee2d77e2e2e9505d2743efead1f324cdf678538b1051cf27d360e981. 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/UST8K1517816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ad07ccce1e6440ba5880032a8f06b659af27abf43554078e7e9ff265124e5e. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/UST8K1517819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8d4fc59b9fee48f1516519e77a94f3b7d70500748b7dbe980e5bb532bf755b2. 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/UST8K1517862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x299459ee0381af8dd2704a9fa69c0118cc4a35990059aeeed25834d43c85cb51. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMPKX1625419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992e5f1794df8ec3e24088a7f058db8b7dcf775edef3166c42a53e2677128cd3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMPKX1625420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ec12cf979412c7b1219a3648b821f432e8e0b121efa36002a47013e8a9960f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMPKX1625423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05353031bacaa36d33f97af0481ff9082c6802957e387a24b7171a417b8a1cb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMPKX1625424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cc5408dd0c3494f0d7c0d1da62431622e792a4fc0784b7920f44dd55cf7494. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QMPKX1625425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e9e279348223dea79700c32ac4961702800229d30989a7ffc9076af613febc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMPKX1625428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x899758b8b5560ef648a760fa3afc99a43b2309195269e757b8b068fe05c49fd6. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QMPKX1625429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56225d61eb658eac433ee67def7cad434dd784eb90720592c141d9f63356b2b4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMPKX1625431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeddc4bf83b4003ac87d3b4ca366113ac84066545d66b0679da90166310b365f. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QMPKX1625432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c5e1a016452951064890cc31239f7a16112288a1fc9d28465f5085244b4203. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QMPKX1625433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce2936dc37853bce6f55ff3e30bdf34490711d9c8c7c6805720f8e284e8fe98. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/NOG841302010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfb05754581cad320777e55979e888195511ff5b928de7e6a9bcf4ea48ab398. 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/UST8K1517852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608d3c41b39aeca8df35a07e8eb5c8035604abee82a79ebd8b30fd44a4493e50. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/UST8K1517857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa69cea4a17d483d07a0954412129d2d9b03a68ef408b6eba4a1846f2aea202. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/UST8K1517858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da1bf4b9c46f00eecd1ba6c89a6da5776f84814ddc3ebb10a969683fa7ae84c. 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/UST8K1568751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872d6ba613a746dab29516d7b88acc26e0461e3f40232148bc4061fd495d7a08. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOCCT1348240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6c7e7acf29b0c70dd81ce78f0f8aed44d564fbd582cbbf2f45c9e129331042. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMPKX1508053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842e08d88bab41d09fddd7f44b5f7083fb950904163811dbd3fb3e1c1773c93e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZANL1767433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6c7e7acf29b0c70dd81ce78f0f8aed44d564fbd582cbbf2f45c9e129331042. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMPKX1508053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49eeafed125ac1b33aa4b59b3420b278c52a19093bb14ea4fb9822a904a5b96. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCADH1703275.