"El reloj" () is a song of the bolero genre, with music and lyrics by Mexican composer and singer Roberto Cantoral, then a member of the Los Tres Caballeros trio. History Cantoral composed the song
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 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 0x66ad0e8c967e933f893de50e723cd0fb0dcbb9393f0edaf6d5f94686c070d90d. 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/cfe6e145-aa87-4a85-bc1f-92ee5f508f5f.json and https://artists.proofprofile.net/proofs/artist/cfe6e145-aa87-4a85-bc1f-92ee5f508f5f.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 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 0xdc286378ad516a842a5cf6752dd685efe944ad7a73156ec3a3a0eab23b91416e. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ARF037500064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe245b7a8ac8a105efe10440253e096315b83ff86310165c8b60339bad4fbad. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ARF037500066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbaeb4649f39c63bce1dfb4237831bfca3db37d27af0337b4f222d0af84708ed. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ARF037500067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f56ebbcd4abab767f032e1860973f802ca3f9a2dd89b8433364878cf4238dd. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/ARF037500069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb341ebe0c7f7ea36460c0b888e9bcbee94a5d45255d2a530448591d5a1d5892. 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/ARF037300078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85435ae339a97db2e6b1012d6689b66af08284981411dc5f38ac0b53fb23a953. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/ARF037300142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf4e582974eb0694729aa98db0a953595cc61efc4e79278fd72e731bc2f9fae. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:41:44Z), 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/ARF037400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0748c77860c07b3fd9d3d351a1ad363a45d018fe32c5dda92170558a995c02a7. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ARF037500070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfe81f84d3b304c5a44770cb4fc6eb1075b32101aef07a027c128c8287293b7. 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/ARF037600112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c396c11877f07cabce80a00d729fc14554ad849842c7ee18296e992635aeb6. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/ARF037600117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3e02ead1c5e1b308c5641faa7e0810e60db6634ece71251df4971a700ae748. 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/ARA231800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa86a9bd9d582b1d77f15713724d8f046eabe2b726e6d3a7f48c3d01d6347e59. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ARA231800021.
50 años: En vivo en el auditorio Belgrano
Alguien Más en Quien Confiar - '74 Single Version
Cinco Décadas de Rock Argentino: 1966 - 2016
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a96e1d19b7dd2bd47df1cf826c5c2ab51289087ea84dff1e15860a3eb6b85c0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ARF037400116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0748c77860c07b3fd9d3d351a1ad363a45d018fe32c5dda92170558a995c02a7. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ARF037500070.
Cinco Décadas de Rock Argentino: Primera Década 1966 - 1976