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 0xf7acb7fe1960accde2a11c80abee96c9fce6d864a091044b3a7ac2dd4105b3ea. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/87369628-2b39-431c-a6cc-dc34fecc8ed4.json and https://artists.proofprofile.net/proofs/artist/87369628-2b39-431c-a6cc-dc34fecc8ed4.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 0x18483974493c678d27321bec525e312b1095d32dbd509e19b4eaf4b7a1aaf851. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGH1394400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8576c09be63dfac2e8f3923402fcaffd9922bf4e364d15f56ec171c0b7fdb9d0. 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/USCGH1394401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa635b643cf2cfcc9a68daae8bddc3880964b60b4ae95a5df3bcbb2ed0d2c49d. Chain 2 (Bitcoin): anchored in block 957198 (2026-07-08T15:54:54Z), 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/USCGH1394403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a76a447b5f05a1a811e988722602fe631e3aaf0359847ca897474c8143eb63e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGH1394404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb672714c230c8a5d4f56189f96f488ed043e4e109e71c34c1325f2c6b38b16a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USCGH1394407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45349bcd937d8056fd5d6e7ea2139a474065e143ea1313553098fca93d4b0c8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USCGH0802906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2165493337b4c62fb173f09b6e89820379eaaa3ccee2a2250ff45506159bb5ea. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGH0802907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57257364b5b58bf6a28290eb0b497fa80194dadd9de625507c18c9f6dbed4ce7. 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/USCGH0802908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f5b7c1e23c4a6ba1e3c26ba0ffb468e313ee2d8017c108ec50bc578085bbcc1. 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/USCGH0802909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86250a93c0baba647112263ef706cfbac871fc20d027fd0dc113ec982c91dac1. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USCGH0802910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd2ff082e408b3be3470c7932d94b146814253e0351ba7ab091451580fc7ef9. 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/USCGH0802911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2eb8ecc0502eb9f1260582dedd75a1d9ca3d3edbb6f1fb81cc9ca0059d6a8a1. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USCGH0802912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735d9e54e4d276f123f1bd6692261f49a429b7a5be5e7ed00e42909d12c76193. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGH0802913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e76f7eb87ec9b6b225f66da24cfc5c4b8c6849de454ae3e0350b9ace38025a. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USCGH0802914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa86115d4fe1aa5c612592ab555ed5a472d23cfdb71538eb994619069075f49. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USCGH0802915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e1a1bd8a71fe7acd998a55e513890ada4ed79c74fd99ea87a41138d0fb0377. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USCGH0802916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b109e489cd59a37d3d1246e9d0b5e84c3bd25e73eebfb618dee7c65468134d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USCGH0802917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9290908e4a03ecda0f5f73a5e8f2d1243207965e4170c670e7b9da06e5d4460. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/USCGH0802918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dba90c3662e2c608c674f4ff5eaac858410ea5f5666136c954697d5581bb11b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USCGH0802919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469a93aa316be796fba86b7c263285fd81a908992f8a09a921e49f3f18868258. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USCGH0802920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71999351fb16674d7331d7ff968e9ee88b1ea96105e284008f445035a9097589. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGH0802921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094be89342bd0690b05454937bacf407c99461200cabcf57ce8c2ff05877e6a2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGH0802922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5b64888e271d870af7bae594e5f5d7b96649abf289e4a622fe88aec4d8f1e4. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/USCGH0802923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1372bfbe8a5039f06a026e22afcef200541a66bae248369b0d6c64bd0f33a0. 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/USCGH0802924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced1c5764775fd630c24f6828ddd1aad84d781ea8e0adc0b048692f42d62732c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGH0802925.