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 0x2bd0cfae6c6c06cb27562315e2f6f5a62ef3699472e80716a6234291357b4b8e. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b554a59b-43bd-474b-88ef-94e4b179c706.json and https://artists.proofprofile.net/proofs/artist/b554a59b-43bd-474b-88ef-94e4b179c706.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 0x9d2c55a8e1462a1292523a54228e681e0b67b39a0a3b4cf41c150fe3bfe8edf6. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/QZNWU2333429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806bc4ca1931d15eeb70d60a8ae96879a08043120fbf1bf3279c3543ffc382c6. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QMZPB1700241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f190500ee8933a4040dd9e8a2b017e9503d46672abfdee1f01cd145479a5e5. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/US4KC1170301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb47241de02146c2b5f2a6df9278e9c995f17e8518df87914386c83c8ac1a85d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/US4KC1170302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14cee36af062f931502cfc5aecb07f84a8233660d6ec00fff77bc08eb6b7e1d2. 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/US4KC1170303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30f9cc03a0953ef3933527f2a17b4438f5cb72434f1b05325b71f22cd971aa1. 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/US4KC1170304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a468ff447b687fe0d397a22dcc0aa82d73505497c73730357b6b7b44cde0d59. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/US4KC1170305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62a6c0628a3b335f0e413ea1f087663d5fb1b13de296e19e4185202f8786c43. 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/US4KC1170306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5cb5760035409176dd3671152a2851a7d3bbb23318438e57e65ae00e5f8afbb. 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/US4KC1170307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904d285ae8cc45a2b59613f52d201fd620a8317993165597983dfac6f6935e4a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US4KC1170308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f624928831633fcdf5a0f68a8119992ddeffd3432b2c80e6e03805ac69e12ee. 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/US4KC1170309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e3a401a2d6d43663cb8a4eaf08857c95631db3aa9e9b90b319e6e308b6f6d4. 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/US4KC1170310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c33b8b9e622d3990aa7c91a55d22df0b7224cac108e9b10797577b3319dfb66. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/US4KC1170311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d674643dc065b4b5ba30c525db8bbf99816c531e455e46767c6a3d28da2797. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/GBSMU1173324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa488110b1745a87944c7c99820e7be98f296a35201cc589144141b4a6b9971af. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBSMU1937041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fb5440ae99dede4e907d0d2099b1e12c550646c2acf94735854528fb3f0ebc. 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/QZDA82587110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc28b1688384b5ae93b3780000494c63307efc4a1a69fdb3a07fac46356a65f3. 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/QZWFM2415209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e742fe87db8ce974a424e3b53492b08e314f0a4fe287acc609c8bd7220c56a1. 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/QZDA42581440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd416e43c82b8da4f6ec1043df89b94b64cb3272667744a19aaa2d37099bddffa. 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/QZWFU2433175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37127d2a45ca44f650f6c9d430f4f749df183945f3d8ece2de238ab26487dcf6. 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/QZDA82587111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9bf73ee0ebd327a018c764b283ead70d95cff8ae7ca4019a52bf9c76e90d93. 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/QZDA82587112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6673aafde613a2670693296c79554010d88bc37efb264f732a09752d71ea6148. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZTB42400592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68380c8d39e31d37a2f453f62941d704f00c442e5acb1192c586f18e10aaed53. 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/QZDA82587113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da841a29e5b24d6dd6fea2ec43add19ccf034f77494fead17bc653457e44573. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZDA82587114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e742fe87db8ce974a424e3b53492b08e314f0a4fe287acc609c8bd7220c56a1. 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/QZDA42581440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd416e43c82b8da4f6ec1043df89b94b64cb3272667744a19aaa2d37099bddffa. 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/QZWFU2433175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc28b1688384b5ae93b3780000494c63307efc4a1a69fdb3a07fac46356a65f3. 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/QZWFM2415209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6673aafde613a2670693296c79554010d88bc37efb264f732a09752d71ea6148. 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/QZTB42400592.