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 0x4fa56fa8d9066ff7191589ae239b7a0f245176d9e450368aebcc42b675dd023f. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1f532344-2670-43b4-8f5e-09087c8b92bf.json and https://artists.proofprofile.net/proofs/artist/1f532344-2670-43b4-8f5e-09087c8b92bf.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 0x0f25f3f05a90371e538aef7b86427d87458958acbecf6f4e666f1398b1747040. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCADC1793237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf6b1a83e7b0736262a018aa11e80852d2ee46c5fa39e755d7036372546c492. 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/TCADC1793337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22f02d066455c95a6b3d5f3e54c1c4c5e1b136366c8b1b9b54cfd4f90b6229f. 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/TCADC1793373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc58fedcc3491a4e487318e17e3edbd53f011b5d7c614738f28e7c183a6fca08f. 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/TCADC1793386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880cea8ee9cb3e68d841daa79b6e667eb27916034000877cb7172435bf84b0d1. 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/TCADC1793406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6f941e0e83e227936dfc7edbbc65d38b6576dd60b600d06acab9601e90b284. 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/TCADC1793846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf36730389b85e8d301b5928f5f119e70f03026d3b74cfd33831e17a9e3af71e. 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/TCADC1793855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d7e73dc5528a880fda1b1baddeddccf7a51c8c40211024f6ff6556eeadeab6. 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/TCADC1793857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9565eb54ce0fce1f04247e227a78b4f1eb21c93edbbf6cfcb87e7d94f1c6f4d. 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/TCADC1793860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13e9c5cf69dc9fbb7395288a3f0838613d17161eb8b6d4f2bfb826cc6648fdb. 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/TCADC1793867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ef9e64d17115a4ed95ad698a81e835ec03478cc40bd9e4e36722368eb2eb73. 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/TCADC1793868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c5e993188cc62f0d83270a71d4fe36469535fb5a470556b4282c086d0f2ebf. 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/TCADC1793870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c18489a1173bc75a73750b2a3e638f23cf4559df9649c03385ae872e315688c. 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/TCADC1793885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bce13cc0a7dc6a60d9de55cf363a04c02fb6bca850e04f9769ada914e6d654c. 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/TCADC1793932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e766694ef809f7be84505f4920e68154ca6e1a2c43d6d0ce49d4601115b44f4. 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/TCADC1793937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5777cc373bcfca0c025f6126b89eae27ea2aea755832a8877381fc1c404b6f10. 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/TCADC1793938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60481b17171639e89af873beb8b0fa17b376523807d840af1c6d0252059b2e6a. 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/TCADC1793939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3439af5d3f0e656574f272faec225db2f1dcb566b309c82133c516bd05bcc5fd. 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/TCADC1793940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289a54b6f5b230cd75d2091024386c8466abcf40540aca52348318d41e92d422. 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/TCADC1793945.
Pouliční Ekonomická 2.5: Notorický Hustler
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab3c639664970447d927854ee93d6d83d60d1da7bb9e6a7750c403323438fa7. 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/TCACR1671295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fbca795c23fd1783443a4a2e366f9a47c8eac817b2432ea2b6e6462b9141d75. 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/TCACR1671296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14ac166071c7ac3b9de21b2b7826c600b4055747e0439e795173999a106da54. 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/TCACR1671300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2783d3ba6fa45c35742d104b888466cce5ad5e9ca23d0b2ed0627abde410bd. 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/TCACR1671301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca25045b551faa7645b3449c6eddd7033569b335cf1e32a5c24abf01b9ddff13. 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/TCACR1671304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc806b6c845b0335ec34dd3dbcffc0a7f0e2ac14fbb13a8818515357a99d898fc. 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/TCACR1671305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0090dc31655a247ed2bb5d5e592dc244be7793b003f6eb57a0b84f5f61b10559. 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/TCACR1671306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d771ff0bf2afc2f53920221dff43a977aeabb1ddf5a4bdb47ef677801ca007. 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/TCACR1671307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd749d4bc3a36946e1aa64716ac3d52a7d7f8a0cc3888bf06a5768e810702e87e. 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/TCACR1671308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f50692ad34747e9e909bcf6586238a45c655c7357f5cc110d27bdc1b4164fd. 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/TCACR1671309.