Ibrahim Ferrer (20 February 1927 – 6 August 2005) was a Cuban singer who played with the group Los Bocucos for nearly forty years. He also performed with Conjunto Sorpresa, Chepín y su Orquesta Orient
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 0x06c9d16e4d001a4f859f50b0ae46227dc94560e6b0f008b7ab382235590b9eb0. 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/adcbd06f-771d-464c-97b6-8531381160de.json and https://artists.proofprofile.net/proofs/artist/adcbd06f-771d-464c-97b6-8531381160de.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 0xdebec76ab2c9b7900ea400b71df781ed4a965ccece955de43134230e5cd62e55. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/DEXO42491397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebef2a4b5eb96457040c97e55f0f25285fc35c807c45e245a84189ff309a520e. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/DEXO42491398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7390e7b591905332b7d0aa3913b6dd700957991efd27675d70d241c2edd2cc12. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DEXO42491403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17fe2f0b259a562aba804f9d3f4892d271a80cc5b2f4a42e1a8a72abb657e9cb. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/DEXO42491405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45afe198e51849d7aafce8d313d62ce3eb66ec723ead8f1895e0fa7cb19758fc. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T15:30:10Z), 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/DEXO42491415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e8a942630fd2065a6918f86674daa4b05b2c238bad822570a0b808844c1faa. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:34:46Z), 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/ES71G2049816.
Buena Vista Social Club Presents Ibrahim Ferrer
Ibrahim Ferrer (Buena Vista Social Club Presents)
Ibrahim Ferrer (Buena Vista Social Club presents)
Buena Vista Social Club presents Ibrahim Ferrer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeee174b6c2c8dcba82d18bf8ad9c5d3a4d0c45b5c61f0479cdc6fd6dd92474e. 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/GBBGU0365005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324550de3589fe48a0c2d64f33b847d37e659d85fccf1cec814faab5f6972205. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBBGU0365006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fcf3786f61bd6eeb628aa9101d0ee9f223d7ebfe3ae7a297fb025fa66a8f351. 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/GBBGU0365008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3850135ed6d5d0e6321fa6af4edc8dd8cccc43439a8e10bfd377269cdac6bf3c. 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/GBBGU0365010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a27110700517e320cc3b74f5cb870d4c94a2554362e920c72013008db988ef. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-16T00:23:24Z), 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/GBBGU0365011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd735742eddbcf676591bd99fb9ca18174e6fbc6f87745d3047e18044b17a3545. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/USUS10510066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe873b6d5c584e8946d32f5fa37cff8f1c9e086c17bf00969d58b373bb4cd444f. 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/USUS10510073.
Cuban Legends - The Essential Ibrahim Ferrer
Mi Sueño (Buena Vista Social Club Presents)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84556f38072f6b69fcd2f7368e746e14b3c51ad5bc28e806ca54c766f5db310e. 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/GBBGU0677006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4001a5359e10e747e84e69e9aa85b2dba17598566e98af1e5d43fdf55d9e9a. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/GBBGU0677007.
Mis Tiempos Con Chepin y Su Orquesta Oriental (feat. Los Bocucos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819829fd64ea69ed8d329ae480cb4c3a7ba38b93338b44573e6a762d02175aa7. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ES6601404612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcab84d7bf0fd32a9cc845f46abd8b4c8eb0ced58a1a31207d6d5ffb1b4034b5. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/ES6601404599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da2c945073ccfdcf2a3df3580f589d1c26f4f4356beb3f5b8471ed9cef968a7. 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/ES6601404600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49dbdc3e44873c667ff698ba64cac0e13fe3f349fc3755322d9f0cfd94a3661. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QMDA71595875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c436f6366f91ceaa76559d9c52a80bf9643a5c26db3e7f755ed67dcd81b231. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T11:38:29Z), 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/DEXO71940572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d4b3c941e3405b3ab25b44515c504a7fccb9d2ccb2fca116555614ca252df8. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/GB5KW1903711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b220e1cb7bb3f609047541f2cc4c230eaf081afafd537fa0f96a6f73c05625f. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/GB5KW1903713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e58595d2fe77897b43a3b1653359e23c2e2b8e3feafdb04ba015cba6faa44b. 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/GB5KW1903714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1039717884106e805ffa8a830c5c884c72b9c6744cd44993f4b147391d4c669. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GB5KW1903717.
Essential Classics, Vol. 784: Ibrahim Ferrer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d1785d5850a616f6139b60e46c29355ef05c9c60c44225fda9824db31d51a9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ES31E2502827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebffb4b60468a238cfbc1d924b6b1cc1a92300697b33a356e4878b037ce9939d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US3DF2408569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfab66484634bd0394a9127454393156935bdae5caf691a6b1bb51d940e2b4f. 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/USA371023308.
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