Marta Sánchez López (born 8 May 1966) is a Spanish singer. She has sold more than 10 million albums. Biography Marta was born in Madrid, Spain. Her father, Antonio Sánchez Camporro, was an Asturian
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 0x35291c88a978f895ab56f98c1908f5763e50aa9c451fa8de53729f113801a266. 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/5ba8e277-f76d-4bef-9a07-dd3361b733fd.json and https://artists.proofprofile.net/proofs/artist/5ba8e277-f76d-4bef-9a07-dd3361b733fd.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 0x06dc0d5a21077b3cdcfd7b2c6d77b1993403c79f0494c5b64c79dac68f953bf3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES71G1413842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf968b2d97113ad5edaad8249dba43a9a52a83355df52d48c393a46ab3131ab9e. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5701000687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682a1bd149785352086eeeca8a94a2ce8fb70232abcbdfe480fe01c824a40f78. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES5701000684.
Escrito Sobre El Viento - Con Antonio Vega
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8593fae3271ac61ff3750820716d0dc4c981fce48ae42e0d99a95708f3385ba. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES5701000691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cd211a7a56205c580bcda1415b7e151d0b5facd0a4fc3d56ef4dcd525a5aeb. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5701000692.
Marta Sanchez En Directo Gira 2005 La Coruña
Vivo Por Ella - En Directo Gira 2005 La Coruña
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe308e56d6092a660f1e2664e994f89480950cf6701af7d657adaf969f18f35. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES5700501181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc39c5979ba48573f941ec271c8eaecd9b554ac73ce056090b0add07afbd63ec. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5700400807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5096d1bf142fc8a74c25c3f618324d741eda9955a7b9c8f7603b57088d8fbfd0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5700400808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe431771d0d61ab1a2ed31c2258963f894a863b26a52d94d9a90578871d317306. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES5700400836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610156b1a8b9ad0490cb6e66a020af461a1b0d6ffabddb334fd0316bb316d968. 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/ES5700600668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4941892ad636179914444f25508eab485899fb14392d1550113a65ccdbfa48e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES94G2300601.
No Pare (feat. Marta Sánchez & Daddy Yankee) [Remixes]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddef76334b5634901ce9b4f712c8133284be8037763aa91f8710fdc8991cdad0. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES94G2000401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c444ddd3097750576b9a8ea28cd141d47d34a6b973932760c6d7ea952082905. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES5151802418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf86668a705fb6102f9ef8d0878fbe17b856824f018a2fad18a965b97a367bcc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES5021800943.
Duermes Mientras Yo Escribo (Hit. La Canción)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06dc0d5a21077b3cdcfd7b2c6d77b1993403c79f0494c5b64c79dac68f953bf3. 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/ES71G1413842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3264c772233375ee4c67a610ad63d49f719c49546e6f1fd89d7ff0373df635aa. 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/ES5701200856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf015739118f2e8979312d8b0cfce899fd6e0c93e74ff2ab4c8890c61edff5d55. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES31E2301387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34653e06527c817d046112f33a372f5743ee663ae1b1ef4eb1819be60fe9e30e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BK4DA2503462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49e06f5e2c959e2f4e1d3d0bd8a8d1db0273755210bcbf094977ab7b24e9a91. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/ES5709904448.