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 0x685999740af8304173d7cb3df0d2577a3ce75012690530f115f2ef9c6363ea2e. Chain 2 (Bitcoin): anchored in block 954058 (2026-06-17T06:34:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/456fd97e-5604-4885-8f32-932ed4dcb4fd.json and https://artists.proofprofile.net/proofs/artist/456fd97e-5604-4885-8f32-932ed4dcb4fd.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 0x5a7ff2e639fa6a5055bf59e71de0adb2359b262ffdec4b00475e3456ce820cba. 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/QZK6K2102201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c42c0b6605a16a4c76ff5119bfd287fc33abf4bb383082b4f50faf65f26c4b4. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZK6K2102206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9397c28ef0331b3638941b1286c037f0171e39a5e008fc2b0679d59aea71ffc7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZHNC2211045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fe84f82969b88161329a6fb01669b6741e320ea97e334fd187d8dafbb69915. 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/QZHN52105297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098349070828af61420f31130a21273c7bdc2b2b44edf8d4e6aa1ee6021b731c. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZNWZ2268300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5251bf4a106de8f216e4685d4a7563b0463497ce9edae9f6f2c15f29ff5ec531. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QZNWZ2268301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300028ee044a98296833e8c893fefbdb0955c40878b9347304cedc3be3fa71a1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWZ2268302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e990557cafb7881792731d9c460742bba68a5a2be076d76f707c969cc43c2d. 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/QZFZ72120125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b90f5da29796e82883af6d5258fb19a22ba1d8ede467784dd40275c9291774. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZNWZ2268303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd00188693a7d15e3be934ea099f1c7f8bc21da4f7aed1fbf9babd91db988260b. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZNWZ2268304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b10d32c277ef09723dd35dd977836c5c63e587833db34d969e999ea83ac2849. 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/QZNWZ2268305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6275ec1b5bd111a4688935fe95e12fb58f16618ba086222b34f1db31844e853. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/QZNWZ2268306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c7d00ebe7af3194039bfaa480ccdaf619b0bb156e029188b0e73d84a7a2453. 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/QZNWZ2268307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfb1f86a796927351555c440d69b99fc589fee182de26c1474826e2afd230ed. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZNWZ2268308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcaf82e66d2418656dab338b332a19682d950426b073088b0bbfbc0510cbe807. 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/QZNWZ2268309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161282b4b643c9e8f48a43cf306fde1485dff1acfc65840aaed7796cc2d9bf1f. 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/QZNWZ2268310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd501bcd69da2bd8cb1bb20b0018c689ed82e09b87ae2ebce0cef2e8ea617c876. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZNWZ2268311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe57fa6b76266b7a84b771db2eeb0226642e90f847b3c745b09dffc70bd4dff. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/QZNWZ2268312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb803c73ceade2f4918026341f88e83c0f6ea55edaa9276c6f80b2061087dd336. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZNWZ2268313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874aa61371c6eb8dd5f7ef136ad90c905462873db7a8d8106f389b487c7c7697. 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/QZNWZ2268314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0a24d0946b887a5b4154bb22cb156ff48a5b36a9afc4e8c6302ac42ed212e2. 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/QZK6H2367468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7704a7ab627f481b0e9b16b7c97fabbc146b9e767b788cd997ab6c3cefca08d5. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZES82207124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a94aa3c088ba4768cb439136f2d36059b07c7e7d2efe6ed87f3ae49df5c64df. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ESA012440769.