thumb| Lidia Borda (born 1966) is an Argentine tango singer. Lidia Borda whom the Rolling Stone described as “the best tango singer of the present” is regarded as the best female voice in the last d
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 0x932cf42da79b920c9df15b85b4d7fe3a162f110b2aa154149b45abad8d7539de. 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/e849f19f-2fbb-4e5f-b91d-013329b8978e.json and https://artists.proofprofile.net/proofs/artist/e849f19f-2fbb-4e5f-b91d-013329b8978e.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 0x3dc011760c2c09bcc2624274cfba12259fe2d2f3a8df44bd1cfff3000969259b. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:32:19Z), 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/ARA100600069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce99145c023daccec42cf068ecf94e489204967ce6f9290d7b078dbbdf60e5c2. 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/ARF050400907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48abc5a240ec9527a380a04ee0e31774b9d0287a7c24a3e431f7daa8fc131d6b. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/USA371072778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0b211df770884758a3b4e858eef14b58312d02b7fe1ebb0324637c009745b2. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/ARZ021103421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5099d3c5bc169de17959cd365ce434ee5fd0971091d20ccfa6e0c07778b065. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ARZ021103422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e39570dace5e6ea62d4257e9a69c3dd24ea4c1a604564de5656e84fa70c3eeb. 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/ARZ021103425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ac5dcc7f7e9483369eba6b86da7e791d9cd3f1eac6623ecb9d4f51252017a5. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:07:17Z), 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/ARZ021103427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4889cda6d17678bc5ccd4324b7393bd82fe1ce0d3bb5b1c53cea70f9f28812a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ARZ021103429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e80e32c14a55a1c41eaa56ae82f3903f16d51a5571fa50e08420a166088d43. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/ARZ021103430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe23caf9eac7b40deec10a01b894b529fa65f8379dccbead4467573974c15869. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/ARZ021103432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4889cda6d17678bc5ccd4324b7393bd82fe1ce0d3bb5b1c53cea70f9f28812a. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/ARZ021103429.
Atahualpa (Canciones de Atahualpa Yupanqui)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51eb8382f265ad368229b12b59fb1f83a2983afb3aca25dcfbe1d77e98437ce. 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/ARZ021800097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc17136b0d2cc1e4af3d0604debd1082ba222ab521ec89b16adb377a05e5d83c1. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/ARBSV2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1565131e1c9cbcdbe32024de1c68ecf21b4be856e566270a2dcf237e5884f8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES7181831509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4025d16c037216b83a97a7ebfbd70dc3540059bc046e962620182a34d99cd6c. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/ARA901800069.
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 0x65be123bf8522d7d08c557f323dc11ad29f25f507d03730b0f0e6c35514edeae. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ARA901800072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b20d4654a1e088cabd6738e4082306844fc55395a6ecc2c50de098e929f34f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ARUEL2300010.