José Antonio Sánchez Ferlosio (1940–2003), commonly known by his nickname Chicho Sánchez Ferlosio, was a Spanish anti-Francoist singer-songwriter and poet. Although the son of Falangist leader Rafael
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 0xf879179505a92be05145a0e0a45ce9fb5ef3fb0452dccfe53b14807bd924b32d. 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/145fca39-f1e6-4f9e-a714-be25e7ce6a21.json and https://artists.proofprofile.net/proofs/artist/145fca39-f1e6-4f9e-a714-be25e7ce6a21.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 0xb5d67fc90f8d39ba8d7eb57dfddc4f9f5a74323ad0c546421323e321c6353845. 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/DEVU51755303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cfbbd56f57d311069e7b9e9ebff770bca479e09ffadce12e38df98a20db2649. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/DEVU51755305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eaf878cd492c478c19b8d3c4ef044b2e63b63a67e594ccb57e3de03133be0c5. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/DEVU51755306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cab18eb3356d7055925f2e20c67089dd42e0030d9d86bc61e0e6caf5326c3f2. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T07:46:32Z), 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/DEVU51755307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6ef288f98d0f1feac5f538ac30169b43dcdc254bf1255d6c75a138683bec88. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:03:26Z), 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/DEVU51755308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55421013dad808d65bfe65e3081666182c1e155f9559346d6a9df14ce77957ba. 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/DEVU51755314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b3604413d440b1ef6348989569290b93fdbee8cdd3368a25a21a056206a329. 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/ES5121000633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382ab47cf42dc5b4831d3b01d6c14c5b06cb64e47e120a3c5e3feb5a2e3a2ca1. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/ES5121000634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c5f7617f05c25c1f2ac3c2ac3d72ea8c63ae3a34e53c73ec52ee249feca188. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:10:55Z), 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/ES5240700110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747db8a5ee8dd38ec40d4baebb3af7b2ad69ef641286f1bc04ff54daa5af4d89. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/ES5240700114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415484269f2acb2f45e60b75900f0639ddf8629c8e7204571531a1e06f752071. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T03:34:58Z), 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/ES5240700116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f633c6d580b138c19ec9b533be32686dfdeb7a5b4adf3c90fe4802df19c51d8. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/ES5240700117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c99d3929491838f71247d1d7dac9da375f76179570bc7271c2dfaadfbc2c9a7. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:26:35Z), 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/ES5240700118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e59330bc1024744f29eaf874d232dcd1d80319f64198ec38b20195499e6ffe6. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/ES5240700121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fcdae020ab89b24f51b92cc1850d2d2c281cefa02b3f8e0755f1181bcaa873. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/ES5240700123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a4a4adc47104f1b57833299b103db561c3cc9127a38ddcffdae8d061b3720c. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/ES5151502860.