Rostros Ocultos is a Mexican rock-pop band founded in 1985, who were moderately well known in the 80s. It was part of the post-movement started by Caifanes, and it was one of the bands that followed 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4437fc861d8e0e1cadf6551a0205487be493eac9b80b9e13e5dea51d54b3d8d6. 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/25176940-e4f6-4f26-93ec-b62604882f5e.json and https://artists.proofprofile.net/proofs/artist/25176940-e4f6-4f26-93ec-b62604882f5e.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 0x176bc4851413fe7208ac61afbea1fe6b8a539abdd98d1c0eccea029dbdb67d22. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USTCZ0952922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61a57af0b6b7c1b616abbc8ef4e75af0656a3935027393aa6445a5ca6ca6b36. 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/TCABN1325876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4236771e3fc488347fa7839b3a7c86fbe91cf53f49b147e06fc5a29c583f480b. 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/TCABN1325882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eee2766bd5a915a77903cad7e4905ebbf07e2483e6da57b7d13f7567ee95dbc. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/TCABN1325890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47cce7e723f96111f4751f1af0e255747d356b83bb7875d3718389b7661e734e. 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/TCABN1325891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697136487e43ca6eb3d75dd13155c06574ff93bc78f5bffbfb58fb244f7e1503. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T22:19:58Z), 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/TCABN1325896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5a1a51fb48042d61c69083a24bdfcd8a507a69e5fb859101628d82618185f5. 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/MXF060700425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8ad5d83aa7284ce8933ad1cd96c692df225a1a739b86807d48cea81c69041f. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/MXF060700431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842cc402bd21e61a8800a3d83a49d961dd32d4c9a2312f67fe3a5b25a5ba5628. 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/MXF440402774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4114a73c07e8ffcdce6d58e77ec8c50e581f0132c7f4424e4779b636c670f227. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/MXF060700419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cab14df18dbcd6ae73d9336577bfcadcb8b71eb17d845243abaee9e6f21e641. 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/MXF060700423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a111c0ec60ceaf7d475283025ef24c9630e14d6d9cd4becb74d35aa6756218. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/MXF061100060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc59304fd89eef860643a7a63e297523bdc0ed37270ef9fae2368748f26ed82. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAFQ2135792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53cc92e95b865a8ecf101aadd38333d88eb5d9ab5e9782c5ca44bb5c2370cc5. 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/TCAFQ2135848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1413d6bb19b4c96d0e6190ecc6421f4efbadb0cc6a533b6e535b32a357cf14. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/MXD782302099.