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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99ea7877a15b0af44434d361df2220e74a2fef2aa33f191d40784d1532e8198. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb586e61-193a-47fc-a39a-22c858926a3e.json and https://artists.proofprofile.net/proofs/artist/eb586e61-193a-47fc-a39a-22c858926a3e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Maquetanderground (Mixtape Maquetas 2009 - 2012)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0cfa00a23431bedff484710be8ca8f0e6933017608150b56d3dab9ce0717fff. 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/TCAGE2255477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b12dff2c132b8e4286f6b7e80bc3812a82b7a06d35a37eb5fe2331671cd1bb. 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/TCAGE2255548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40dbd275ca03f2e02b71a9b7a4ca5a67157eb892d8041b0c043d5d473fb5675. 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/TCAGE2255552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691e5d88e1a377cbdf6caa2710d29a37e731526e49b1448bed65c3fa123f14d0. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/TCAGE2270383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150739d2500efbd45d948f7359ca9946bdf72b2d00c6ba67cb1455549d1c277c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAGE2271045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bef1f8663ea286dd3c0563bf02f77bb961e921d91fdd0f3cae4caff499b9a7. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAGE2271076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b82fc64beeb56c32130a3dfdc3d7ca19552cfacaa25e333a2efe57e91c965c. 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/TCAGE2271189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba3cf9ebab44e489b81362bb9b855de13a2a3ea79f30ef65149c44bc0b9005a. 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/TCAGE2271241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddcc8358edeaf9353ab3aae761c7ab27a1a78926480611910e9d285a10720931. 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/TCAGE2271247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f6670d6ea29f5de78d74f5057ac786b4ac15ffdaa7f415f4c6e1deccff1330. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/TCAGE2271263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ccbdbcf3489b9c17017d776a2f5438d15303e935834cd0ffd3636d2c03b488. 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/TCAGE2271270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c50e332545da8a76c319c7cb21db0a7786efc14975516ab817b325ae01919e. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/TCAGE2271286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x126a28976b552ebb9aa10056a3c6b0ca6d4d9fab0f118b53a39e631cf48f5449. 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/TCAGE2271292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6790ac032b5ad51780f75dca0b61a4c1d8e24d7be7692ee6ffc8ec4470366df. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T06:49:05Z), 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/TCAGE2271305.