Siero is a municipality of the autonomous community of Asturias, in northern Spain. With a population of 52,194 as of 2023, Siero is the fourth most populous municipality in Asturias. It has a total o
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 0x10db844918108be74791d6644a1da03716e0d9f234f49926477a0a53b978a935. 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/91d85fce-0207-4d60-820e-a4e9d4ef6dcf.json and https://artists.proofprofile.net/proofs/artist/91d85fce-0207-4d60-820e-a4e9d4ef6dcf.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 0x1045af2258bb7251ed42d5b5b8d592ee6f55875bcb1dd8534c876362ee97c881. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TCJPY2315949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4204c68dfbd0a17c0ff73aef031cf6ce668a118ada75f13bb228c04cabe6b0fa. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCJPB2458055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e7d392828806a4535467c216252a8c303a2471541278102c30b5e1a4186536. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCJPB2461634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323b0b4d601fa9fa1438a962c1f4c0b7ce52b18fa3d7baf841e2bdbc47d50343. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/TCJPB2461640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc957920b5ac2470d8602c8ab78207128aed10cf6c1464bf1222b42db9aa406c. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/TCJPB2461644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e33f6712d15e6da023749d6541ac94cfc44bf12e825e3883f8eb0ec1a1f089. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/TCJPB2461647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f143f31294592228f428798d6fae230db590deee6071f344745ff0d4b660c4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCJPB2461651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32da6baf4d7c0af035295505b12b46becebdbbce55464dd24f7416b4e4e41d4. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCJPC2474289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e7a7847c2a71378f98100de58821ca9832315a8bdeac2cba0fe4455aef638f. 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/TCJPD2431176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d8a6dcc48fd1d8065b3805d8609f26998234edc210adbdfd0df9d14bee4d48. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCJPD2542690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed61cb90a539a7120d67f585e8cc279ae5cf4a54adbff12230dc9935d0350f5. 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/TCJPD2542694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ab037c06311beee07699f51bae94e2c14248dafaf1dbd51602bf79087a8e77. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/TCJPD2542693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb80c38e3c257fcc23e03d394474f8b3b32a8fcd0512ad2708935ed56b6c1747. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCJPI2595917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8527f88e7835aadf0b07822aede2c7f62e9d4f178d723abc9ab6f0fad8f3be2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCJPI2595922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15cc86fd53eae198ca94bb55634767312cefde43d815c328fd534f0d9b531948. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCJPG2571293.