The Circus Maximus (Latin for "largest circus"; Italian: Circo Massimo) is an ancient Roman chariot-racing stadium and mass entertainment venue in Rome, Italy. In the valley between the Aventine and P
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 0xbe7c4c65244363686fd15faa9a128e2300baf31f043aa6474bcdbbcbeaf3cab1. 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/0424c039-1e87-44c3-9d2c-6cbc87925462.json and https://artists.proofprofile.net/proofs/artist/0424c039-1e87-44c3-9d2c-6cbc87925462.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 0x2dc27850deaa36b351eba68105b37af5c6fb1339af114e8f1bc5096c3587b76e. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/NO5F31601040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03b8842f0dbd6ba4a0fa5a0401d8cc4a4ecf0f05f685834d124f8bb2fc9f8a1. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/NO5F31601050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf460b1c22d2a9323f7e594860276c624bfb9b500ce53aaccc1200b62ee906ee. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NO5F31601060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa32aed3ce54fc5f9c88abad8303621d9e22e17318741d18c85d38c09074978. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/NO5F31601070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b13cae8c46aa6a0e45b92b18437d713fbdb7ce7f5cc4596c7d442fe05c5f4c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NO5F31601080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d48cc674661d91200b8a8b369ce8334c73afe7879a139203faf82b5b814683. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/ITG270700237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284eb44256cacd8ec25db27f15733cac93e5207a24b32236ffef4aecb1e63cbf. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ITG270700238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a02ea02599ae4d6acb1eca5ed3fed69a054a5de3df811ce6ff399b9c4a29ac9. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/ITG270700239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f8b9f5fb4edd7d6e62d61e7b3d4bcdb1f7e25548f85509269a14213808cc9c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T03:10:52Z), 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/ITG270700240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4503106fd06d3907d09d6dbdd92dffc83d89b46dc21df3b5407befe515b96e0e. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/ITG271200206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9dd6a63189edc7bcb0d4507335f5c68fa5decde6faf87f8ed0686511eb7dd58. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/ITG271600125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092b19413420ffaad6ff60ea48ac98c58bfe9cec33382db01565952b5b63a864. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ITG271600126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4cb2c750097df13edac664e36e95544bf43020e5dffe7fafe74829c153fe5f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ITG271600128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2544c04ca2831ea4a47fe09281a1940472848b3d229e9ac5c7a445e49138a78. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ITG271600131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7593c5146746c112bd0ef182c1e5502dec1678c49034ee7c54e3a1641208aed. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ITG271600132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575439c4f89e7322dc8ea4447d042d6b4d83a8cda134a7c845ba2bd76f6305da. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ITG271600133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb14e9eeca04085920e9a196b2788bc246189c4ac3bd05b8eb4691c8a05f0a3. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:11:31Z), 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/ITG271600134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5dc9c92adb42522d63751bff4944cae373ef0c50d1e5309d0eea78ad81c904. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:07:38Z), 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/NO5F31902010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4190b4bb9f8f432b45dfe61be79f279957503e45d9eac10215c1061a2c62678f. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/NO5F31902020.