Grupo Niche is a salsa group founded in 1978 in Cali, Colombia. It enjoyed great popularity throughout Latin America. It was founded by Jairo Varela and Alexis Lozano. Varela remained with the group t
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 0x4d32550750ca5e54a2d44c2f33ece44e7ed73cf14845b1fc1b4cd3d0417aaf3e. 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/0d310ce9-fcd7-41f7-b70b-f0dab6da50b9.json and https://artists.proofprofile.net/proofs/artist/0d310ce9-fcd7-41f7-b70b-f0dab6da50b9.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 0x491a1710d758ca01b8d7fc51906a7f557654fc1eb2f49c5e44ec0b78bc4770bd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD19905030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358948ec88f6db09ec4a3f50b634eeb0bd196eb903a839b89bf5180f057d2bb7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD19905036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa349425dbaa74b89501b696aca98d06902f3a44aa4f15ad363c30815607c23. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD19905038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8055304abddb37e65e4208b16df5ef9844f2b7c7dc8d36df3043ff9dbfd706. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD19905032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07ddbf78d7747534551c70b8ec95cf11079be993b8a799759422eff931a98d2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD19905034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45fa9aa337132de8bc208fe6f7bb639b761cc31270fb48d32c639265a65c0da1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD19905043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541a25a89f6ce12134761d801a73898200567b52f6be4726bfcf78517f426dc1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD19905039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27c29f6806c82bbe392f9d878fe8e3f7c6e95cb9aeb9866d8158519c35c306a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD10004393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44630efdb8e5c56741a2f8773b40b03da30a24ce823379b6e2e5af3b0896fc2a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD10004394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9627e0f4e92022c79e1024b2245f6a525eeff51f51c13c007fa2e2dfbc57e836. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD10004395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd456c5904d82c451912b7faac82c09ba3fe3fc3e963ab0e041d126ce16cafc12. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD19905037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c5a744f0544f0337942e1e53e21fc9561743c4e51cb49ddb1301139bc641ee. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD19905040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122cb0653495fc90d0fc5f9491c61e686386cf8660f78dd66caabcbb0199d66c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD10004396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2425aec8a4800c275b889b3a082e4099f52ec11bd5dd2f91bc1a4fc2c52e9c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD19905041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c45abacd10aeec095728ce26fa52d6267832f49cbce6a889711d38660be17b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD10004397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba76d829e8485f490968943952839133fce8a4929075b90dab8d6a775aa85ea5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD10004398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4641b2521e146912e0da7248bf0f9ef17c8e4d791ff95eddc729de6395777e75. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USSD10204711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01de8fd26839f52423292b9668233a599f3f1660e0891d8d9760cbba4ead0842. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSD19905029.