Etiqueta Negra (Spanish for "Black Label") may refer to: Etiqueta Negra (magazine) BEHER (ham) products line Etiqueta Negra (Black Label): acorn-fed ham Etiqueta Negra, album by Milly Quezada y los Ve
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 0x73f5d0e95217fe44c976fa2709e314e792e649207f157997c96585d3ab36f37a. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff3194a8-1705-45e5-9452-1dda941596fc.json and https://artists.proofprofile.net/proofs/artist/ff3194a8-1705-45e5-9452-1dda941596fc.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 0xd94aacb7081b2377163e5a42f19c795224c4bacbd06b0594e020ab912f28e286. 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/QZ22B1739150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8608b1671055a02a5e3010170128fb026633c183c3cff150f4e41863a065a6e2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZ22B1739152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360ed430457c867fc0b44bfa0f35dbdf194c1cdfc8eebba11e94cc9a667e178f. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QZ22B1739154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2d2713b0085d40e6e46b445302d6758527e0dbd6149c1d7c4512807a8293f2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZ22B1739155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de259fbae0fe05b65e0bfdca2d154116253bafb1d46c62082aa7a300b025a4c. 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/QZ22B1739157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b9859c21efa8480a9ae56fd9b608a6817d8f9a4113e5a5819037b1c10f6c61. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T15:10:30Z), 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/QZ22B1739158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c374a65a22e0f547185daee5eaccfb6d742b53b7c88dee4e21634c51b3953ef. 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/QZ22B1739159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed9cfa2e1ca5039fa5719fcb493d9617b34f61d4b8869e080309df6dc5fa813. 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/QZ22B1739163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e36a0f6d2d6fd9696e122ddcb8a139a972f02edc07b2437bbafe661c14f04eb. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZ22B1739148.
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 0x32bfeb18883b97206b5665c4fcce536073f00c89f24e739124675d60eed54418. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZ22B1739151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa493aadaf6ada3c926a36da8e554cff854489c0cb5fe731a46a83006ee58216. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZ22B1739164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde648ce204f502020c2762591de7419411a31f622ed58e95a81efc5d641c9ec3. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZ22B1739165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55056c58bb7c8669f403d38e4eec4a9051dd35c2e5a00f44bcdd68852f89f366. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZ22B1739166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b1de4c34b6fccf2c788bd7d71d21b9b9ccb799cc2e93b043a0ba7bef25e6d6. 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/FR2X42399173.