thumb|alt=Depiction of inference using modus ponens|Logic studies valid forms of inference like . Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is
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 0x16d145c60880b21ea4911c96b6ceb530ffdec3565b1799a75aaf6729e7b8d379. 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/fbd45f14-06bd-4da3-b8d6-5fa8f5665bc5.json and https://artists.proofprofile.net/proofs/artist/fbd45f14-06bd-4da3-b8d6-5fa8f5665bc5.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 0xf1d202ad4027f9415c8584c5b8dc9adcad450173aaaf12dc702f1e26c46937cb. 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/BGA471400634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc58b317dc4ee81da19578f94752ed43eb6eb6e0f25b30b3afea42b48b5fc1d5e. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/BGA471400635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08fe558dda67d2f96cca90ab98e5cb2e5d2ec04643c1cfe3067e0ac65d4f182. 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/BGA471400636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b0a57b42e2febf9a336ba08a44cec4d6d125d3b6ab795fe5fe761b0e090332. 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/BGA471400637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5ed1a3fe2008ae73ab7afbdb941288e079e38989f1491704f5e40837fff40d. 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/BGA471400638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85951878e5cab68cc00f902ac41cb2fca41b266eff432f37e1c1a3d0585cb513. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/BGA471400639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d6d09b128b9e86d02d5fac2bdeb48c9b77b56503a8c74de6bc3cf1e694dfbb. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BGA471400641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9b78462fefa680d0d67d3f31f8b0abe4ac3f6e451462cea576cf3b0b00d1dc. 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/BGA471400643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59688cb43d61d5eb055a7132efd59281b5e81fa900b68d253870a2fe60945fa2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BGA471400645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc16c23585adf37bb63231678c0fa7b83012d936f710a4f23b62e51b24797927. 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/BGA471400953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43706f7a53b1286a199e4e8f4c9520fae9d662fd8f17d0ecee201f677972a949. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/BGA471400962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2a1116c8f6544967acd6e4f431c96ffc0215d59b000cadffb3fe2493b0cc2d. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/GB5D41100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfeff1bc56bed86165edec819146b12ab972fcc318884145a28041f3bda069e0. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GBMJG1412593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e5bcd336e07fdfab7808b3cbf1b92ffa91a13315bacbee06df1a11ae0a20e9. 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/GBMJG1412598.
Our Day Will Come Freestyle (Brapp HD Series)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3bcd9490ac4efed4d5e326c4dff847055fb497310e9c2ee6fb2743e94487af8. 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/BGA472502915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700505d0ac2f42e0c3aae5b8397339041e0a20b75bc7d98770ecd880998493c5. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/BGA472520216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ce8b7b513d9e5837593a570780a8a1267576a0f3383708d81802b7be2d7cc2. 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/QZTB32376037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2752f012f0860c466890cd52b8beae9442423aca7ca75f68f235ecabef73af7b. 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/GBDLM2200093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539ee57bd48747b199512265c989b129d73298583bc75f147986ab7be7f3c355. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZTBA2399794.