Niko Etxart is a Basque singer-songwriter and musician born in 1953 in Altzürükü, Soule, Basque Country. He's widely reputed in the Basque area for being a forerunner of Basque rock and bridging the g
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 0xf2eaf6e1c2f0e8dc1ebc59b285768d34c97efbc1484ce27c23b498c0a35451c6. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a2e7b88-f906-47df-864f-291fd6dbf947.json and https://artists.proofprofile.net/proofs/artist/2a2e7b88-f906-47df-864f-291fd6dbf947.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 0xc3135149c911c56b5dcbc3c8c03e8f825962307e7c4ad8e0b581680ea2bee5d6. 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/ES5590900274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7869b0a90d3393a429674442c5704d8cc36910dbc0fa9b39f9d928ee67eed5fb. 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/ES5590800234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2942148fdeda215ebf9818ed0d60cfc7227937a30c17c3a0ecd419b3a0e976. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ES5590800232.
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 0x4cacea3330c64cddcfb1682b6fb6b9bc476b0fcf4ede16a19dbc461e2df74de7. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:02:06Z), 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/ES5590800237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4d63bee79cf6a13df9baeb326c8dae7e1571b1435e53de4959d43960ebdc72. 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/ES5151101827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e1e66c3cba0628b85995218528e3f39d6d54ffd28e515979587e8c1a07557b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ES5151101828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf9874d060af1ec75cd5c833d4bfc6d81ac6c768af24b12e7f27a382f14de59. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ES5151101824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbaf03817e94d4409d70e4113a56289237e0cfc43f2aeef5c2093a47085f0ee3. 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/ES5151101814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4841d88aab04c5e9f5914afc5bcb1dbb44220ca417553d4b142325aa663457. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ES5151101817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f44031fbaf6f674c73c8e5f0460478ec7e57796f09e30965182445127cfb44. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES5151101819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f651b62981147c0d1d7739dee10355736836ddb00ad7092eac27ab9a57760e. 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/ES5151101820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4387705159701d68addcba14e00372eff83d631e7c1de0e4b295678e826f7345. 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/ES5151101821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585361146c8fb844433166b785526e0d0988e2c6f371284799e2a233155c39fb. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ES5151101822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc2ebd3e43c8b8c3927777bfafad80a76259cf904bd5ff8d4439ebfbbe324ff. 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/ES5591900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf359c8a7cb54d6db719455dca09bedd2428d086c47d69189e3892b29fbb29dcb. 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/FRZ510800321.