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 0xbc01b14ccdd1edf4017eff91e1af28e18fa2e02268733f3d9f3e2e920573633e. 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/d284aac7-600b-4284-9cd0-17dbd5cee6c1.json and https://artists.proofprofile.net/proofs/artist/d284aac7-600b-4284-9cd0-17dbd5cee6c1.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 0x8a7a3d48b1ca4f2cbac3ab8bfb7c5a5972d1bf64443c6842637af33bd83634f6. 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/HKD012318094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e419be6ce4a4cc7a237bea7327f3e4472ca60e6d484f1444b9e4c6e4ae37101. 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/HKD012318087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd93d9770e21c4a4d127d0bc84cf7200f5fdf9a55946e261653d40388b7a6d7. 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/HKG732430032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd24fe456f8ed4f33d7eef1ce2c1be7498d3534ec3c83c90d0a588cc41af181. 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/HKG732430029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef534d32dbdcd75f75162510df830d54c5d2c9b1e758ee63530c426c2f1c5198. 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/HKG732426054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5591e27e3bd58896479713ac936aa730f7fa996759cdda9bd5d772a5db26e24d. 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/HKG732421979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735261b68cfbc4318f306a8550f955a4db8b9c156c345a2877c8161433897c99. 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/HKG731698820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc9cba9f8f668732a91fa6d2bdcc4ccb6273f8b3be28d5e4b13386f9aeab7458. 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/HKG731697974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e8fe1738f6607d503d4e5a0974d7b1dcc5da28e6920dacdc38de5e454550fdf. 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/HKG731684973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0db506c45fa3e778fd472e8379cb11fa8ba18d9c0cf4ee792d2fce747a8b0f. 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/HKG731682802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb88d399a1369739c62844e62edd16e39fb1b7b57ba0c6cbd60a73baf0d48e2. 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/HKG731680720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9b38c14a1e0dfb07f03c753c618b7b57d1e86c1324ee6276c45f707c9285b1. 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/HKG731680719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6d820ad56653531bdd997487f45b6a7780fc9f5695633c1d1b2e5f75470307. 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/HKG731651147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade23567765a13b8b52493c4773ffaa7f8d1a36d4df9508dcff972477178d2f4. 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/HKG731651554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65c13ef3cd00089b9c31016b4f88fdb6b7311fe830b9be33765d55a473d95dd. 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/HKG731610898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375026c2c99e02ec4af11390e0eebe50ddf2537303c4db726c170df8d70dbc61. 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/HKG731604462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec9a68036c8f39dce5b8afdf4726829cdb4db2319f8255697aa77c9cc49dc86. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/HKG732390921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e45a4ad86e43c3ba6bac8e8647752eef78a82cec74dcffcc3633b876d5b985a. 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/HKG732387785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90535e16d5716c1c3439f933464b953ea3f0ee1bdf2dbd727c9fb80ea2f96aa8. 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/HKG731672860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c2aabed41ae3f3ba2014324926ad85b055b3c1a7134281d20caa2fa2f430b3. 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/HKG731603069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6994e02b51d9067241feccf6eb8ac65cc09afde9808d66ba89419444fef7a328. 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/HKG732357477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd640714a988b3c2bb4ddc2833e0c562435e5206746e695b8264cfa9d60c5ddf4. 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/HKG732348628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b16a9edf31c32a6934d097553d0f10d7a508740c8a7465d76be380b0603c65f. 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/HKG732345921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f717e620d5aa583711c91d4242d753dd2b3f1465e3bf6b1f939fba347375552. 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/HKD012344339.