Horn may refer to: Common uses Horn (acoustic), a tapered sound guide Horn antenna Horn loudspeaker Vehicle horn Train horn Horn (anatomy), a pointed, bony projection on the head of various anim
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 0xaed3fbfa2bbf1caa26eec16e2f3225eb1f0df629f304169e66b4be8e38f727b9. 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/ab0fb4c3-839e-4be4-b94a-b63af64ff1f0.json and https://artists.proofprofile.net/proofs/artist/ab0fb4c3-839e-4be4-b94a-b63af64ff1f0.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 0xc1424979d0f64e61609bd753f5955da7d33cf3688c4d1c7029d901329aa2594d. 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/QZFYY2023176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e99441b6fe7da8afc33f30a582f8b958bf0ed9299bf1ee2d4f2908acd3ce9a. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZFYY2023178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d1a69644c76fbdc5a1172e45e4d3726b9a3806a229aa1503865076edd42c70. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QZFYY2023180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e34f7c128c182019bec9a98053ce0d15ccb346a649a9038e1a149d2005b2a46. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:45:27Z), 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/QZFYY2021399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da9c31341da78e8b5e52871a1a8d57fc41ebd58e451db6c81b6b5c4d54f3ae2. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZFYY2021401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ca9244c0b3c08516e131c3818acf6d1fc35da750489a708d5097af156f3253. 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/QZFYY2021402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851922f8cf0c9219484ac92a2bc2e7dcea41a13f3f48d64575c10dc7e1b8e0da. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZFYY2021403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152d3b8caddedd386820463b69d505955e538e8e81be273381444f27856439f4. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T02:52:32Z), 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/QZFYY2021404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a8d21ad3799e7dbfb3ee60627e8e8f5b31096ff9bb72df4f89ddea259bdc1c. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZES82045865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092c9f8027b3c76f95f4ee879275f7edc17e6ce666a07317e095db1a174abece. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T03:49:01Z), 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/QZHN92267028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21f0ed93ee9f1fd9b7e5e1fdb2da0666e90784febac71c00cff4afeb8987843. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZHN92267029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5bb9833b1aa5850e6e621925e89b88841b0538a5c980b9f431698fe7fc8b79. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZHN92267031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa461f351950e2519a58257560a79dc36ae26ba4c2d4fd34292837ad717fade. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZHN92267034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248e04bd39a506df2ec17c099bb3ebad099782d4fb5c2dd82d5c62f1b1bcb7f0. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZHN62494937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fab60a8f47619f58eb9b4e8097136cd487e8dbd05a2a4703b0ad2c547bc0159. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZHN62494938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744d0920fd9bb437bf9cbe2151d42dee91d44bfc1f0f2490beb404d27a551332. 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/QZHN62494939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92419eb8ca85d99394becca13dbb4473f7cec9ca2672904721022a727f2619d8. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZHN62494940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfebba6dac8d3b3d038675660427705718e976d6043cf47a092433ca622a07c. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZHN62494941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a5b446034aa3d8ed27027aaaa5800168676e00c1d5d0d02b42df2551e6f300. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZHN62494943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb67bf8326644b61dcf92f7f3ef48393bd22f778c85bb512b22ba662a26d310d. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZHN62494944.