Harold López-Nussa Torres is a Cuban jazz pianist. He lives in Havana's Vedado neighborhood in Cuba and has French ancestry on his grandmother's side. López-Nussa gave a concert in the 2006 Montreux
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 0x51b44d838274e67c0e6b8f50ce7dfc7986f2f80560c24d59927f51b1f316d98e. 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/5da727dc-9127-45c3-8f35-616ebee74c48.json and https://artists.proofprofile.net/proofs/artist/5da727dc-9127-45c3-8f35-616ebee74c48.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 0xe080a5642c348084339b02d65b775d11d511f2c040bd9f7a25fc38ea34d0587a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-20T12:17:06Z), 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/DEE790922410.
Una Tarde Cualquiera En Paris (to Bebo Valdes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4ea366e1e9f89180e611bfa782210124800363cf0e406044b18a9db7e83e65. 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/USMAR1813503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa311d18b4bca3702ed75750f802feb1386543b9f8732fc209e219f787a074380. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USMAR1813506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd7aeefc26a3ea7e44f81fab6b3200c0a93eb3d514a2ba6cc2c73f0b24eee5e. 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/USMAR1813509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb18e9a916360d2e9e1ac022091a653788b2579484547699ca4bc53257ae8275. 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/USMAR1813510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d41d1702a6bc260084c607065c6430936a6c015aebe60e260c15a64e819058. 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/USMAR1813511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba30ca0560c84cbc0a20520154c4c18c6241794c16d1f12a9d4e3fbcdff20ae. 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/USMAR2017901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04583920aaad703ac40fb49750fdaf3f82e2d6a984f7f3c3c3eb5002d35c3c90. 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/USMAR2017903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf918c21da0cc228311977b4e553ceeaaa67d0a53dcfcc63112be98d60b3fd45c. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/USMAR2017905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5742dfcfb2b09c89fecda678d5db0935b65d2a49fc4555bd5b578c6f1236ea1. 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/USMAR2017908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbe0f7f3f665890af4558ffb1a45ecded1f5648a813841c03900c439ec05c9d. 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/USMAR2017909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac72776720c9ccc9f89d06d145ffcdf0fc0e19805f43c6afb7571d9cfc88c157. 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/USUM72305967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ac64dc95eb31c6d2aed6312f03c4c5115b680679a8b3fe10f6ce2f63832678. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/USUM72305971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551d276752f4db6fc50d089c1dcd1b811fadcb5d85753ab672bfda34fd6d3fdb. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/USUM72505971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f39dc1b97b36fde2e5fcea790034833f8bb2b511ea92f8ab267b7cf84034c5d. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T18:18:45Z), 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/USUM72505985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551d276752f4db6fc50d089c1dcd1b811fadcb5d85753ab672bfda34fd6d3fdb. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USUM72505971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x269b0974644470127600d1d8fe86537f27651275aaee44222528fbcfc5250f6a. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/USUM72505975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348d8253a935f4685db044f3e221eb37166cbdcbf86c34fe5aa015f30b80fdcb. 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/USUM72505977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f39dc1b97b36fde2e5fcea790034833f8bb2b511ea92f8ab267b7cf84034c5d. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/USUM72505985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafedb05b73e556b7765c7cdf09b74c65b32cf10499157d9bffd7996f0e81e25. 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/USUM72505987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3cddc32ea73c1da0b42f6426fdd25c90e7bdd6aeb96876210b2822904e5686. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:45:07Z), 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/USUM72506006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2f9a71eb07541b39efeef80189c66ce9bb5d0d62a82c2ab4ba872b4ad67824. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T15:11:00Z), 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/USUM72506008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe882329ab6307ff5c37ea2717c5f79b5c97433262a37247c0aec5b2b8ee2419e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB2H71200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d36187fa035197a8088caf4467274d984f70c035e417e9ce934e133d99f970. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GB2H71200076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb887bfd09dca4eca4a3bbf9a56a91b1c0ea27c6dcc035e395a2e47312a821c34. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GB2H71200073.
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 0x5927050b289f1380987dcbd1cdf01a5d75c4a085169a1d29c47f03bb835918c1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GB2H71200074.