N/A (or sometimes n/a or N.A.) is a common abbreviation in tables and lists for the phrases not applicable,Barbara H. Foley, English In Action (2003), p. 192.Alan C. Kay, J., Metzler Contracting Co. L
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3cdcd0670eb0aecb30b5d88c156ba840e3c43ff85c2ee915280f506a4baf4a. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0ffcebc-150b-45df-935b-17a12d5f94be.json and https://artists.proofprofile.net/proofs/artist/b0ffcebc-150b-45df-935b-17a12d5f94be.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23edea74b1bb164e82d22918cdd99f37b125de834c24be703c8d76e87813787. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/TCJPM2030299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91157ebc2788376f6f5f55c3a64137c949bdfa1f63e3f8e83a5db834c27cf2da. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T03:08:31Z), 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/TCJPM2030300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d89b429582fc771dea3cfa6c5f5e9a0e920ea8f000ab0b3e9011f8cca271980. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/TCJPM2030302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d56d4a51a95b5830c0a295289ff0b0220d7c9e4a4eb3f80ccf037c5bca342ba. 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/TCJPM2030305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76caac0310175a4c96e3d450e24af6ccedef9c663c1036588f3f236e6e2397d4. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/TCJPM2030306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4d1764327fcdae71f3c6929e6e391134906da9131d43574a980ae14dcedf35. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T00:24:52Z), 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/TCJPM2030308.