Leon, Léon (French) or León (Spanish) may refer to: Places Europe León, Spain, capital city of the Province of León Province of León, Spain Kingdom of León, an independent state in the Iberian Pe
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 0xbac93dc1375fbc4c2fc33f35b4cf498001e87ce0fd58532b7949a1a1c2326135. 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/d954d4f6-5679-4ee8-b298-bf4f51e8a199.json and https://artists.proofprofile.net/proofs/artist/d954d4f6-5679-4ee8-b298-bf4f51e8a199.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 0xed1b087f1c97727e61765e34c77bb3205de7b849236b4c7cc7d0569a3d6a81e9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/RSA221820012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8492d0532a0a300cdc26febf8ab457fc4266481411c24c64191e9c273c34ef8c. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/RSA221820170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d93d8a2dad18234a14428a5b33fe1da9cbe532d4bea71fc291934b795a07a8d. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/RSA221900351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db930c0b502e8c340d7dd555747d328bebcb2a00b79de39a34bc78c6cd92ca8. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/RSA222100259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c1132cbba0fd84de08ea2d31bca353cab65d728d3b74c6b3b703559b4c01d5. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/RSA222091442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce2f8f2f721f17bf0b1fe4e12d933f80809f4ea765985d29f0a68d0c812a3236. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/RSA222091545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0683d6858c20cc224c86110af5464ad03e36d0a32218a510311e21009208ed44. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/RSA222190970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887e395d19506a327d306b8966e232c7a864ba3b350e813bac6980a948fef920. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/RSA222191092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e88a62c03e9c74a6e5b59c232321e6394f8e4d28a34490d4b1a076b98c7c6f5. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/RSA222305148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a4e7599eec95afbf8bb2f12ee616d66b3d1721dd1ca31988bdcf25384977ce. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/RSA222305662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7370c624aa696b41c8299505e2041a7b201c7c4569cf51cea5a93a5073acd4ce. 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/RSA222307922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69dd602c9f13cd2492f267ed49868d48412fa2c6770c561cf7b59752c87937ad. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/ATAJ12300870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a52304d44d0df5c006a5c7263db23f843cc72ff1d6670077f91b3af7a02618d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ATAJ12300872.