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 0x237f9c18c80609fde4473c056ff079813057805f47398482508c32bf9be17640. 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/1fd6e3ce-9c98-4edd-8822-fd7acccd0300.json and https://artists.proofprofile.net/proofs/artist/1fd6e3ce-9c98-4edd-8822-fd7acccd0300.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 0x392554df14006c8e385d41449bc4d3189838d0e8d538bf016a9beaeb81099b04. 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/NLCK41060600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea86268c1d4f604d198d2a0021736a4bc429f5b22c3c89521dbb5704423bf32. 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/NLCK41060608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17310d4ca8ae6c8778b437115dcaf5c041cbe7d758e3c7c854e61868d773ed23. 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/FRX201529651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1425c5f724d17f135b7679c1ad12b19af028e44fca671c9bc335b5ad3892f9b8. 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/DEBL61437979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d862bede50df46550f65fecb98cec0f43f5562d34ebdb5eb3c7d36fec19769f. 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/NLCK42219356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192dd09d2ebead8ee7f1e136da1e9f30aa96420d8b8426728ea77cad36ba94e7. 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/DEAE62200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7ef60bf67cbce3edb09af139133813416220a492426a1f2ace8a869badd4e6. 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/DEAE62200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eee1dabf5ac6f912c5e2d4c8c7d7696242290c07fb431c6fe7bcefb06ba3dd7. 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/NLCK41095617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a2fbe1d1952357aaba9449f85d0f25f78b8a55ec6620b031df82960f0a2c21. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:29:52Z), 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/NLCK41095618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8c1c2ba9e551865d1745a32ac38bf02458497919c3762f6e5fd1b0865d24be. 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/NLCK41087111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c91e2084f64f3fc2b688eb8b79e57973c2ba15ba4d504506d67b0dc984a7b3. 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/NLCK41076916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705b2b0e14a63ee0b86049d5bc406f8d8e28e74318945ee0e50af1b32e18951d. 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/NLCK41076917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0635b81d28a329eda8caa6a6f45cd99647da01905e13729cf8459fa6cdcfd958. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEAE62000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2eb74f91fb4fa0f04f36028e9773c22f896ec0aa7aad73b9e724cec72e3487. 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/NLCK41062285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc34ec29542f0fe61f06cf7594a2715bac5a89cfbacc0a91b240536ccbfa259b. 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/NLCK41062286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638c39a58eb877d55e656000c08454f0fb76f07af9e86a7bcfaad511c6b7fb3d. 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/NLCK41053068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3a1069243137696920d3379f7ce5058b0eb61dfb2cd0b0cadcbda4dec0e6d1. 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/NLCK41043637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6c165d6cc80baa413e4b5176ece8825f6a4eb88ca768aeb2407bb459e6f393. 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/ITDY21600053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fcc18ee0bc5d0e24bdcc298a8c449bffd72c86c958b58b6ead08c9089909bb. 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/ITDY21600054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c19033b7c60e5203ef7a4aa4d556007c2558b44bcb4db4128d65954ac03cfb. 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/FR10S1544991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17310d4ca8ae6c8778b437115dcaf5c041cbe7d758e3c7c854e61868d773ed23. 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/FRX201529651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1425c5f724d17f135b7679c1ad12b19af028e44fca671c9bc335b5ad3892f9b8. 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/DEBL61437979.