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 0x033910ecd09d9d8928f1bd0854a96b1458997c0dac925fda5cd494fb69840344. 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/400019eb-da45-444f-9d46-2ca3ccd19410.json and https://artists.proofprofile.net/proofs/artist/400019eb-da45-444f-9d46-2ca3ccd19410.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 0xe443d3b3a047f9ac6d3d27df3ef909bceabdcad09447e03edd7372011cc02e1f. 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/DEWO71700097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968cf56985da54844ca90f50039f15087b0a6b66631d07fcc45fa019b27c282d. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DEWO71700118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab4b7581467d945f40063f9d20bea8d7a32f3c3df5f2c057a003c755f08b2f4. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/DEWO71700145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f255578d87fb6269906c0c7da0ef072b36dd118ebd5edb4d63d651335c5f807. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEWO71700165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7717b3a93b37c67026d030933b420e3c4b9d78fe39b34f80fcb3ef921a4d7017. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DEWO71700167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39752fe097a90dc4ed95886c44f3bc2836bca2d5b9fb3593085f47e8869fc78b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DEWO71700211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212278f7cbde7a3dcf238b7233baca6892f3d0db305f9de726d913e9f699e481. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/DEWO71700284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc079e9f0e5fa37aa935ffd2ba8cfa14a458217b38532d179c745f90f892aeb48. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEWO71700305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0ece616186806b87418cfb4554300509fccdaaf5e9fba6a64b825534c2205b. 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/DEWO71700377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a782ef2340f926cd1f3b97ca2152363842a0b17a129b8642c7199bcdcca2fc0. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/DEWO71700323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce0bf1a8f41bfb87f64cb27bebe78fb0a4f5f27d678373b888099aa66e466eb. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEWO71700324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14986fbec1736b4c6bbfe8aad9342dff01b1e4708702fb6660af17d7809ae0c0. 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/DEWO71700325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc079e9f0e5fa37aa935ffd2ba8cfa14a458217b38532d179c745f90f892aeb48. 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/DEWO71700305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20948f7b79021f6cfcefe242619b312f9ad8712d14e3b1090a1bc4c79dff2bd5. 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/DEWO71700417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62eb5e95d3879155a93ae3e1e975401dcabf6fe4161e962dbe20437e1ebd96e3. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/DEWO71700426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72959f82d93148cec599dfeab3dd1196cd6e0e79c1aa92eef3567a37890b264b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/DEWO71700445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8f1fb927cb0329ca78c913e097b0a64d1eeb2d47abd6593165634de26326b5. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/DEWO71700459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9c28672d9fe7d80ee87392f44ad2afc868c42bddffa44128f482d17a371806. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/DEWO71700481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20948f7b79021f6cfcefe242619b312f9ad8712d14e3b1090a1bc4c79dff2bd5. 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/DEWO71700417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72959f82d93148cec599dfeab3dd1196cd6e0e79c1aa92eef3567a37890b264b. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/DEWO71700445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9c28672d9fe7d80ee87392f44ad2afc868c42bddffa44128f482d17a371806. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/DEWO71700481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58478c2418df6a9fc81ffd638f87c1f2de126d6a7ad12b9d0537e3926a30c68a. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/DEWO71700832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8baea14b8ae20e506e717aed11d6fdd89ab0fce199da9e64d1268eb484dbbb2. 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/DEWO71700611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8baea14b8ae20e506e717aed11d6fdd89ab0fce199da9e64d1268eb484dbbb2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEWO71700611.