Bilbao or Bilbo is a city in northern Spain, the largest city in the province of Biscay and in the autonomous community of the Basque Country. With a population of 347,342 as of 2024, it is the 11th m
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 0xa2228c9295df98eb3fbf419aa06d94684145f9ae5ec78aed172f7eda13d5059f. 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/77ce9753-4ead-4d29-9aca-7089f5c375dc.json and https://artists.proofprofile.net/proofs/artist/77ce9753-4ead-4d29-9aca-7089f5c375dc.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 0x20e27bc64cafdca4dcb3208a2e6e777cc1e38a1b19d887b468eee3a2615cb421. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZHZ61916968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8cd51db6b240ac0989e87ca103137e0964c4ff98259479408b1b863213f2bf7. 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/FRX282240277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8cd51db6b240ac0989e87ca103137e0964c4ff98259479408b1b863213f2bf7. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/FRX282240277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb242338caec2056f4767b475f463521eef439c8e662b415a8f9a609a23934578. 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/DGA072306103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb242338caec2056f4767b475f463521eef439c8e662b415a8f9a609a23934578. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/DGA072306103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb767b0da390fb6533302712bb63f16edd4eec32e97d29a501f0caa714aef3175. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DGA092397586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7ecff21e0caaaf5dcf7b31849a352c9b12fd30c232b24a9d5bbe8ab6b439e3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DGA0M2332643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0f830d8456bf15a81fcf5f0981c6b9ddc5c25cc8085115080281b87aedd8b4. 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/DGA0H2352876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0f830d8456bf15a81fcf5f0981c6b9ddc5c25cc8085115080281b87aedd8b4. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/DGA0H2352876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d7c342fcb7e9de1fe8771483e11a05288af79e01d2fe9ff18b00466a1da8bc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DGA0P2308442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab4500af00ec26d59a87d8d682a3a07e086351419d3a717e6f5a8f5e0449a7bb. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/DGA0P2496186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec21f08930fe32fb5e360463b883675801300a5a1488f4f7c51ad77047811ba. 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/DGA0Q2432982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec21f08930fe32fb5e360463b883675801300a5a1488f4f7c51ad77047811ba. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/DGA0Q2432982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867b449783d53333718b6b1428503987336326e96e5597a8eb2080d40b7de81a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ8B2504083.