Blu or BLU may refer to: Businesses and brands Blu (Italian company), a telecommunications company Blu Manga, an imprint of Tokyopop blu eCigs, a brand of electronic cigarette owned by Imperial Tobac
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 0xc2e72900eff268492f5c4640e5b24998472b1797a9290f55361a7c4a0390bdab. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1952c638-67af-4fb2-b52b-6fa5d6e1d77a.json and https://artists.proofprofile.net/proofs/artist/1952c638-67af-4fb2-b52b-6fa5d6e1d77a.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 0x555a5d8b44a45e5def3ee9e67b0a758215b116aa8c7ea9ea6193bf35b70ce30e. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USHM21170671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c6f1680760a702a67ab5d2884704854d26f2bb865af6c5de1e1f2c65966c01. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T13:00:27Z), 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/USHM21170672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec86a460fad00d17fb3a055619f5ce3547b2b5c3f571f7629105e87bac639af9. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USHM21170673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c729ae8ae5d32b81ff1feb41e39b30a4c60149f8f5f71c5a0b201f3f34c3956. 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/USHM21170680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e66403cc9d8e5beb2dca7880d8922d69452610375a33be9523c8d54712bf6c0. 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/USHM21170687.
Give Me My Flowers While I Can Still Smell Them
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30fb1c69db4de7b0f37943408a80805809e5347d2be25db1044aa2b5894df5f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USUYG1135289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0dfb2c0ff7cba2d607b7c3a67e75fcc3a48ac195ef484545d02a1f1a2d504b. 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/US6881000654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6864f4a91f98f1daf2cf41659b2d26641d0bc2436ba281ae62ad4827a33dbb0c. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USLD90816321.
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 0x4a8abed0e0bd27ee1b00526e27b69aa6b3fbacc027e7ad07c18920a22495e6b3. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/SEYOK1313338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f32b461e441e5156bea156c9b8ecf3799a42fe323d0d44acdc58729e6227647. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/JPZ920802010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d7ad7b37c1f5b3c7f2d63defb58be810f9cd187decaed603ae6b9e6e6c6db7. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/US92U1614702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1caf804bc4ece8fc38ce352926cf54912c7a9c62c36871cb06766c4b37441b73. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/US6680913651.