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 0xfec751d01e1e2c4211a8ac59db7ca7a8e938d836f2a310d6a6032275a4d77baa. 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/bda61ae3-a57a-496b-a9b8-768877cc5da0.json and https://artists.proofprofile.net/proofs/artist/bda61ae3-a57a-496b-a9b8-768877cc5da0.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x800db8ea546b3c9170a4fa7eda8b52b2bab1221499d623b9df0caf34f1f00016. 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/QZGLS2307667.
El Sur Es Hardcore (La Venganza de los Mc's, Pt. 2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93fc02d979264f90a2d907e25869a4b943f13e82bdd03c5237ba2eaacc226df. 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/QZNJV2357905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2069f9490a2b769fdc77bcee7196f7749d45420a2614d5883ccbaebed96a9c1. 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/ARIXB2401990.
Maquetanderground (Mixtape Maquetas 2009 - 2012)
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 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 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 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 0x2c0d2972e642243d443173949a02044cd3ee4f6dbbe3b8c6043c37983037be5d. 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/TCAEX2079392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc9dd3edc5bb49659a291f22b8f3898ba0853123ca3cf67aa77fc416c0d70fd. 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/TCAEX2079434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92717c3cb12bb29905256e46439cc3f4bdd936326ffeb38e112b37f3d0cde94b. 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/TCAEX2079440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd3ab93347bac006cf8157c9ec4b80784de934699cc925d61b35dbe73eee889. 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/TCAEX2079462.
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.
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 0x4123936b385f909fec01ceaa7d44f7c3dcb58956678572687cba31b21f235b07. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/TCAEX2079182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f05c80f4d7c4210afca379a96330f3450b8a687c6744afffa4a97d0bad500a5. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/TCAEX2079365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01758336d6c2b65d6eaba7b262a6b274196f95ea235d8a511ee6595cf2c62d7f. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/TCAEX2079373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc53c8f06890d35a7bb2408de842706a64f7a5a85bc4856ea6670727e4f2e25. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/TCAEX2079430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9172d4b169bfda095440001f9dbea8ebb88435791a45dfa729749201d62ce4f. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/TCAEX2079457.