William Vargas Trujillo (born September 17, 1970, in Havana) is a retired male weightlifter from Cuba. He competed for his native country at the 1996 Summer Olympics, and thrice won a gold medal at th
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 0x1293a47f12675ac7366f313e20f5e031d78da5b32fb5b5ce68305d835f9c98bb. 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/3a7e5acc-3dac-4bae-b0b4-c7114bd95d8d.json and https://artists.proofprofile.net/proofs/artist/3a7e5acc-3dac-4bae-b0b4-c7114bd95d8d.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 0x161d9d9d557b1a45579366d7acb58add0afa5e5f70c73cf442a4d5f20e7c83b3. 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/QZWFH2302750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4673e40dc4bbc6dd0ca5afb8d7e82ffd1f612766ce18c43cd22a4c19e6ebf4f0. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZWFH2302751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798478d0f7a575ca95235bfa3b3318dd813604a7b7e6b3a83f5774c1d989cb56. 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/QZWFH2302752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85e5646106a1be5342992095bab1b6d613d72a93070ee72d6567b2d24b8bd22. 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/QZWFH2302753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe07f7ee3b3d48d2fb17002f15e0c8f39aff9a30b6aca53b819412e8b5dc76f. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZWFH2302754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163b2a4a3a8c291d7f406067899c8ddc8b12f907df1b9160d2e17d20e3278952. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QZWFH2302755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebba662b0de8a43f74df76d77ddb0e7132d744c27d161eea38afbed9c0919d2. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZWFH2302756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778afdd0415f791e047ef3a66d7540c932391764d6f219ad88133933839b78ba. 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/QZWFH2302757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a91e4390d02376b26309069311aa8b2d56f55b36c3a3d66e572c078510432a. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZWFH2302758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa4f57ae05c30ae2c7770f123da85089d9e941cc722d7a189cce57db7480618. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZWFH2302759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04cabc2987cf682323e8c82b5a3b8f4ced844f1d9b6adf967555e4818dc1cab2. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZWFH2302760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd17eda532754c16eb358f653dabbf4a37957dc0ab3ef3bd18332cd24ba56d8. 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/QZWFH2302761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c6d0d15d471e9486a2438219d9b9fb84de3458e5c2f5a2bd54e8c2d9f68f4a. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T22:43:16Z), 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/QZWFH2302762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d8e8b592ca4195d78fda9436918459d0f8d4316bcfc823206af5bd09086d70. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZWFH2302763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c87c02b1aa2b4d059f8ca8ae94f830df70974b39a4a856a9b3931c2477794b. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZWFH2302764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cb2ae44c1d909ec97c363b2c3d6eda0faf5b8ebb5611d40bd1649f9ed3b5591. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QZWFH2302765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25da11f3d0a6c709f41d66fa34e0cb8dcac424507846634c3dec3b0ec323c11b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:23:23Z), 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/QZWFH2302766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6bc09127e5f1fc8de4e884055d2cfce90e75a9bea055aebb7b7fe6c124c17c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFH2302767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579450c373be6b5f7ee3b66bfe45c0740a03e0b00b06fdb3b70355bc136c0944. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTBD2422300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594d0f43e3566c7d5710714801e08d0976eabaf9b11e7821bb1f90cc889d14fc. 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/QZZ7U2559851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46e5286c6f19e96455f5b386fb464a172dfe5268c8d8c87f1d3e077de9937b8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ7U2585527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c8f8d53e23c31862107d412287e1ee4859eb16a48a28c3e7a5f10d41aeb60f. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ7X2515336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33fa430fe695a4e74ce369a04da6715e1bb671cad3f7fbe6e42f05bf9f3aacb. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZZ7V2518937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65c1bb03029be7eba9bb9f4e229fa69e6103dc45c66da6a8902d6a815f45c1e. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZZ7V2518941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61951142c64437f5cdd65c34aa76e795f2d68cb7392e50d10252e47a67799b15. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ7V2516209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb41c18c3fc17a9252baa291fcb839435edf6235f7aff34f7e2ebf7a97b194f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ7V2516313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3178efe668723ab27d741921b5fba83e793a953bb2138a3933bb2bc01d1de7f0. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZZ7U2559890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5d71b23e552d7f58c0a4f3e44f01c8b81c8f1cee2bee40852374ac80dcdeb2. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZZ7U2559852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441460a4a45dc1b01638eb4313cb1ada2dc221f0f04148adc0fc61c7114547b8. 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/QZZ7U2559858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8f8d715f72fdba9afaa00cd6894e358b6c663f8385725db3060b998075f227. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T10:49:45Z), 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/QZZ7X2575136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc44359a5bc9396adf7bd746b65ba5186ba61e8f738834bd8fecd3a8117da935. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:59:43Z), 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/QT6EA2577621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ca5c9a64d14cf79d728f31c02aa566012e43baa88ab38a67aff9ad95a875e2. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QT6EA2565298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c20e20cd83f0dccc741c3c7020e76e843e86729f43b53e9d4ae763fa22eacf. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QT6EA2582012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596f6a24b41331a071368ea5199fe90914975d34c9986f568bad32946c76640e. 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/QT6EA2582029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4294fb2fa54d36bf2eea40ffc679e19280b903fb72f7e2b366cf8e1af6d221. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QT6EA2589945.