Tulio Enrique León (October 11, 1938 ‒ March 18, 1982) was a Venezuelan organist, composer, and arranger. Born in Maracaibo, Venezuela, he would become one of Venezuela's most popular artists and came
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 0xde818221ff0933bbc94590b5a1fa7df749731635905ebf22547ee9ef772694b0. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef6c0730-9f36-469c-a397-07fdb9479fab.json and https://artists.proofprofile.net/proofs/artist/ef6c0730-9f36-469c-a397-07fdb9479fab.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
El Artista del Teclado y Su Nuevo Estilo al Órgano
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 0x2da495c7a1c357a2a16b30b969c67ae7deca29f283fabd8202a1590517820d16. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QMBZ92271836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8283cdf036b487537cba41be9d77fa9a646bd2de26542d80e64530308b572940. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QM4TX2477236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45109cf0966f5b09cf5b926f3daa1eda940769ec0ccc2644498c442ada8c6884. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QM6MZ2288028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5972a5877f1cf434d616427b7241d90fdf12006702b312a0fdbe52d8e68a455. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QM6MZ2288021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611080f112f09467ae15a497df9101f9126e98559a72994dfc1affbdd79f42ea. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T17:56:50Z), 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/QMBZ92271827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052f220467e3df86d00828eba04be9b80f26e7a9c8c5c879a08d421523628cd1. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T04:55:14Z), 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/QMBZ92271829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b754212472cf188c1181d3f0f021478aa25f5d961821cf6152981948b2800a. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QMBZ92271833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb8b6c47c1b82f91a6f3b6c66d6caf5b650d1a29bb304a0199daa4feaf40c3b. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:45:28Z), 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/QZNW72309975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5972a5877f1cf434d616427b7241d90fdf12006702b312a0fdbe52d8e68a455. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QM6MZ2288021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45109cf0966f5b09cf5b926f3daa1eda940769ec0ccc2644498c442ada8c6884. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QM6MZ2288028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de23ba3976700d5b7369356d5dde88ec80a0426d0d5f4baff57ff88484da32d. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM6N22233035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475b03d15678117dd9961c352ef167fc23fba7acda0e529dc8c114b88c19c947. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QM6N22250845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135089b1ff276caa5f6df913a05c62f1f06cdadc6cd31398909068d82498be32. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T03:59:28Z), 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/QM6MZ2287959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1178782b4349245aeda40051f9bcfbcfa3cdaa10b3d6bbcaa9530e315330073. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T18:20:31Z), 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/QM6MZ2287965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7370ed0343699395c7f4927826ee8f73ecf62536a4e7675646ab66c10dab4f52. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QMBZ92250118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808ab89402e138e1b18eaa6b9ddd040da533c1df551a58d8414521120fbbe378. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T03:41:59Z), 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/QM4TW2455566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665eabc1279ff37e29a22a3fc181e9499f3a669b7a16f9266a4f9c4fc88278d9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMBZ92271824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc467771752c480fc25907baeb973ac92f4af6fed9aeab117c2da5ec506a04c5. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QMBZ92271826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611080f112f09467ae15a497df9101f9126e98559a72994dfc1affbdd79f42ea. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QMBZ92271827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e5bd971eb15540eea33a7f72d56d0d630c3bb00a92717e25d86a5c9a3ffe18. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:01:20Z), 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/QMBZ92271828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052f220467e3df86d00828eba04be9b80f26e7a9c8c5c879a08d421523628cd1. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QMBZ92271829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2921f0d39f0682929ce2ee8750269780b34d1beac23a85ba138584d3a10f9afc. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-22T01:20:37Z), 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/QMBZ92271830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c49cd9688cf5e7ff20083360acda400d6b82e679093a6a5c6e49ab6ec20e1d3. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:06:04Z), 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/QMBZ92271831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b754212472cf188c1181d3f0f021478aa25f5d961821cf6152981948b2800a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QMBZ92271833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f34bba4dd1abf3b4655b312ea472039d922c86bd12e877effec3951a48ffe7. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QMBZ92271834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da495c7a1c357a2a16b30b969c67ae7deca29f283fabd8202a1590517820d16. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QMBZ92271836.