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 0x830606ef2d310f9a10cd5de23b2cfbacd3d64d397c4999c0944f1d0bcc63fd8d. 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/47cf518b-6950-405c-9d92-fcb8558f2fb9.json and https://artists.proofprofile.net/proofs/artist/47cf518b-6950-405c-9d92-fcb8558f2fb9.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 0xb1b8310232bf4e4879ef9c5b8a493cb23c9ff7b5e970ff0ebd25424f5ea3ae09. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/NLT2H2100284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad92f6f10ac8f9dcd43a5f80d908169a30c840d19808ec48b33254defc5e8ae. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/NLT2H2100612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e712949e3cefc334249fa8aa7c3c7799e269d58ae5ac28ecb3ca1c34255f086. 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/NL4WT2000227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c951ddf4ec1248aad164cca5e4f9d9d260298e2d47916622788ea0b4f8c3261. 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/NL4WT2000228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc14ae198190b80ebd7793faa5b64284a914e937f8b6ed1917de0d6a699d2dc. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/NLT2H2200064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21f4bac188104991e3a3289bb2ce49c03ab53604433d4a7672b8a41aa9a4e28. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/NL4WT2200071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21610d5595fe1b91f84b84209a981f18ab02b659a9fe3d7efee5fa336a0de399. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/NL4WT2200090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9622f10f376aa9fcd140f119766e23b0016c637a818a05f425e946c0ed3a3f. 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/NLT2H2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3461ac5bb5881deff39114d4ea710128305f17b22f00d8f06e1e320a28934c. 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/NL4WT2300110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5cb2ef058c8943e48de844ea2dfd4172365e1789971c0ad6265bbfbfd25a0f. 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/NL4WT2300126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x242352a54044097f3cd6b5079ab112cdd555ff13193990ad5cf2e11966716659. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/NL4WT2300152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e24afa4f20d7a7b971d4fca38d6541543863929185ac71d5fe9e9ca111680b. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/NL4WT2300166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2fd6478e2a60c0bcd369b363e5234660ccafadcdfc53085a3ccc24b842b108a. 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/NL4WT2300173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540ec65c0d4bcb356ab3de2b2b1fb9e28861604fd9a30b42c2b0c042c9ebbc5f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLE612100055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda9b8811361fb4d1fe84b8e6c791331c0a6ed9f42ebbf7a54698d9c37e49d73. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/NLE612100056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e81c4f353010d44c045d7a5c755abd9384623adfba73799be854cd87d7dc1a. 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/NL4WT2400045.