David Civera Gracia (born in Teruel, Aragón, Spain on 8 January 1979) is a Spanish singer. Biography Civera was born in Teruel, in 1979. His parents are José and Pilar and he has two sisters, Sonia i
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 0x5b2a5f209fbb028ec8c938ee5f8b4f7b4eaf6253f399bb8c852ebb7d17cc71a3. 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/bc11c41d-964d-421c-972c-f1cb41bb104b.json and https://artists.proofprofile.net/proofs/artist/bc11c41d-964d-421c-972c-f1cb41bb104b.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 0x09173002d699e1ca46c8467a3ec8fd8d053d4fa8ce5a469d52524609f76c40e6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES6010100041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea94894793cf0238d6617fa8c6a6f06d9b01d28eea419711a77f11b7669916b3. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ES6010200196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eae3eb89a419165709a8b85ad0163e62d18c01a60effd14965b2ed8de259da1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:39:34Z), 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/ES6010300192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de2ee94f7e1908d04ff5aa9d9fdc09bd6dc689c0d86d71ba87abba50c5555b4. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T16:03:31Z), 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/ES6010300195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3d8e32c2b5b557e0c793f93dc74daa5b614f71df0983a890bdd79080b585fa. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ES5700703058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9abdad983fd792ea7bea9629064e141b954541e0ac6e12a9f67b564dde140d5. 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/ES5700801108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1fbb8d416ea059a52c93274355186cf8abe4891759f4082cdc6245221abb71. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/ES6010100043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5fe60093099706daa0021776d9577bf762232ac37d2cf001f8d249563952d58. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES6010300198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a2577ee2e1dc214eee1ecd3ac05f954d4610b91be21f17bd08fc90e80dfeaf. 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/ES6010500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc1770a52a463522bd2ccbf2a469485131d3e35d02325878c09bf1bf9146216. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T08:22:16Z), 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/ES80B0900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5242be8b0df3d0ace7e432f897af4b575c707d59d9bf03754cb8582874305b5e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T08:01:53Z), 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/ES80B1100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2cacb862741a2ec5460547f46155d5536a3c24f45e672a8799de972e96081b. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/ES80B1100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5715494803a61a0afdc499e0dca09889981e5bce9d95625bb5335660488bc2. 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/ES80B1100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01458f7cab965b8459acf22a24251ec3b4a35c8a1f4e0847b242258c988ccabc. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/ES80B1300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7b20c6e8844331b3a269d2f9c7e9da3690973ed4d9edd512f22c4e7b3b48f2. 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/ES80B1600033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6874eb68f54dc250a9581fc473b8990569da1890752a628dbdda76b3655eca2d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES80B1600036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda410900c2c7d2bd161802473e7b5db772292ad952726ca47f194affbb8a5f72. 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/ES80B1600038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e092f06d8dec7202b7a200b85d715fcb85474a44be3ec860110eee50a824e03. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES80B1600043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638b97cd4a749054adad07b5c347d3b43f2b9f69756a42b112d45d4083ec083a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:43:16Z), 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/ES80B1900044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2521dbd371c657ecc6c1bc174341f8bc4cb3fffd95e3011e643cfebdbe7c20. 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/ES71G2217860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69577cfc6e75bf84e94067683b48713466e6b22516c35db95c3b3dd154be17ee. 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/ES71G2314704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c389e08ea23ea1346ba4873b27f3f6bc8403699c296f00572aaf27c0b285a6b. 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/ESUM72301680.
Ein Sombrero Für Guan (feat. Wolter Kroes & David Civera)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb506e0d93cc80b5d08ffa83142538664b03046a1b7786139a4267f00cc79af68. 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/TCACZ1783435.