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 0x9a33fb74f638bba1be3b79eb9865b04c99b81442206b13842a3aa4d0f1d9332f. 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/d7f55bc9-a7c3-4aa2-8ce6-b005f5646337.json and https://artists.proofprofile.net/proofs/artist/d7f55bc9-a7c3-4aa2-8ce6-b005f5646337.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 0xfff31c8d53d33354d3a408ff9872f32ddfb35419b5e55fffb9ce079ae635b259. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZKUS2148940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3bb9ca62878e5f756e6b274baa8cfae3337be75954dde2e7bcb8000137f87a6. 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/QZKUS2148935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6984d980af3823b9b334b75332df7fd85db638235a135cbaeb4044a4cf200cf4. 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/QZRP42161746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf27266022f5cb998b74074823de5da26881a980c680d5231c6cd6d1bff9a873c. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZDA62251029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316d39176022c87c7c2d2837c27b52317aa35cfa9400bc141ed6aa9b3bd63152. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZES92216786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd91b1504c658563287deb7bc95346c2df5e9845c26921076eda8e4a34c6303. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6N2241087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa60ae9ba19fe50acd79589a0908c7ba023df96a376b3178bccf9a6bb60d9f7. 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/QZKUS2150015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfed9353ff99a50879c22e549632916691710e9e71fee054f48a8b135470a3f. 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/QZK6Q2202528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe570584ffe9e401f8137ef945e18bb01d2d1402fe0ce56463a04ed7d9056dd. 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/QZK6N2241094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49cb443a11f3983551b72bdc7485be7f16709e03160f6c07b45fc4ec106b7b0. 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/ROGRV2201830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903dc4ef6f6ae7b91811d9e0b6bf6455f95d14f1dfa4416910f3b8a2736d9580. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/ROGRV2201836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83fd52cd0173fa3827900934ae65fb029f18eadc29ed830f7307076554678693. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T03:02:04Z), 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/ROGRS2300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec86ec13c35222880a8e6f5f065592044154b7f409e60647a2b41783b8ea7af. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:31:24Z), 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/ROGRS2300047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70000d94b64bfb51bfcd47893ae5e4afdac237f07344ff2090ac7d453a8b987a. 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/ROGRS2300048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd1213256bb5f17298b245c75c07f72427791f31427e69cb0c2ccae0d1290b7. 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/ROGRS2300050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e74d80ecdba368acf2aa24ba5b0fd4be1e1d70e8a9d529373022c1f977517b. 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/ROROT2304240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2799ed02ed7b50ab2e8ae2cd3d42732f3b6fd302dd392056a03a1d678c8fe8cd. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ROROT2400300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819494652ca40479f7df8de875e846026f8e6a8989bdc49edf9530886533e53b. 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/ROROT2400310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfafbfcfb901a4e2ffaa10aaa7e228bd72c2e365cc6f504dc20b9582c15e46513. 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/ROROT2400330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd726955fb8687185b713d5a5377320e61bbd8ef75e8b6598d0a8c8fa7e33d4c. 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/ROROT2400360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225b8e6ab14d7040eb5fd33e751ac9a2e01d46d81d83e0e0c6204d1c8d03f537. 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/ROROT2400370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac496dfb4edf88655ac2473945929752353885130f21635be686756cb0fb0e0b. 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/ROROT2400390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e74d80ecdba368acf2aa24ba5b0fd4be1e1d70e8a9d529373022c1f977517b. 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/ROROT2304240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f59f08c3725cb93fe805903ee0ee37df9e0208deae9bee9db29fa455d7b66c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ROROT2500700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0430e395a7fa3ea27e3f040136173d96c34e66d7ac27d8676ca4fda81fb6f229. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:39:24Z), 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/FRX872560643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d6d81ec1bcc0b9544b0c213c8ad4a54f8143826089b9cac32e2d3e511cc51d. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:28:59Z), 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/FRX872560644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99a889bb80629b35dcd9ad15e12ddf784f5ad0dbb883f2994f7004dd72847c2d. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:04:56Z), 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/FRX872560645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc1013de3b18a1c2628d7ba4df558c8ae9563ebf4d3e289baf5a9dbf9f517c8. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:53:52Z), 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/FRX872560646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa783bc7f8c43391b1bd153fc90f27580e42ca4eec5bdf68438c435bda30c61d1. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/FRX872560647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14550980cf4a520ef493e8e7e9ed07c8d8808927c4fe390762ed9620ca90a7a3. 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/FRX872478282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5cb924a9d73136fc790a2026596a9f8dee7457c48a703d079e8e45fcf9436be. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRX872478285.