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 0x2e5cd34616b7c902d9bb79286ff73515ea7f63da78de9a38025ccb601f00e578. 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/8024bfca-614c-49cc-96bc-5d317c8b0edd.json and https://artists.proofprofile.net/proofs/artist/8024bfca-614c-49cc-96bc-5d317c8b0edd.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 0xc137727872fc911d7e21d08da514c8ac57b654cbb179283b6be23b0200326296. 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/FRIDO2210689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77849acec44ed498ed0ff401c9342497787749d77d0adb5e4c8f9eb2a4b12d1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEQ022392033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65fc50c0a74c58810f944ff97ea6a595c7618d8ed874215602535bedf0b2251f. 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/DEQ022392037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9368438e77ac03c5e48ff6cac772a0adfeb63e8c63ae4deea557058465a744e6. 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/DEQ022392032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77849acec44ed498ed0ff401c9342497787749d77d0adb5e4c8f9eb2a4b12d1. 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/DEQ022392033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2d4b35d5bc710801a9e6f4b8853a83a67da54d8480f66bace8308573fe9d1e. 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/DEQ022392034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ff7ed3cfcf64ce601cbc08d1e715b363f224a313e76924f886cbe1efc4dbae. 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/DEQ022392035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38dcf44688c8b4f9ede376fb1b820c1276781034cf64dfd6e4d9d9af9e3bebaa. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEQ022392036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65fc50c0a74c58810f944ff97ea6a595c7618d8ed874215602535bedf0b2251f. 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/DEQ022392037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4147546a60cc6ec2ea7cfd3697db9184eac7aa72f60e62e46056d666dd4025ab. 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/DEQ022392038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd4a391a46045bd51c900dbd154bf0be7c18f3f66a4e742d4ba8edabdcc241b. 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/DEQ022392039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x394b5a9f3f67e1e322633dffc58a92c4903f48e13a97436b77779749639ebc65. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/FRX202557464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe16b24e6d052e6d0c2af43e5e9c5075d874c06486c9f9f8dc3bdf0eebafe56a. 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/DEQ022291122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84fb2972ccbe89748ad82e0d48896d5a4b6aafd6ae9d53e8b02ada8601a08828. 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/DEQ022291124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8414e5b91309ef82cb60692385b435da9c0b0d83e220e51337ebbc52a00bd654. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DEQ022291125.