thumb|HF's position in the electromagnetic spectrum. High frequency (HF) is the ITU designation for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the de
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 0xceeb3a862ff78f6a366294d045c06553177cdd63c3348899db0b137c1aaf457d. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84dacbff-3877-476b-9a57-d53d78355e99.json and https://artists.proofprofile.net/proofs/artist/84dacbff-3877-476b-9a57-d53d78355e99.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 0xa6f079675c5665438d52bd1dc34b1fd313d43e0ba08e514859b693b493ea6de1. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/BEB682000557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2681f82a5292250f8d241cc588c4c2dbbb161b492fe49574cd49bdeda128d566. 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/NLH2L2000161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec0dbdd5d29c0f3db8585ccbc055361f260f5db0eaf8b80d63c03de3df78fe1. 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/NLFL71800913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d241d4937bc9e8ba7326d9df2235a544aad80c9f4b8378a3a854d3774b02ff. 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/NLFL71800925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff8d7e8abb33bcafe7a564bdb94b211212405bea3098437ee03c00956b71556. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NLFL71800916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bae33c87059d4f30d22646e3ef76a8e1c4150dd7a7008f1297ba198b7fdeaee. 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/NLFL71800912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c4709561aecf58c135dc8059fe03e6903bc8ff4a6578be53052dcb964544c9. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/NLFL71800915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ebedda6ca0c39c035971034a266d883c57888a6b1aa2aa1336dae4fe6ef06b. 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/NLFL71800914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea026759e88c3fb5cc7fb5682e3eca1b908b7297cbed55dfcfa1071c2cf8e44. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLFL71800917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7f3397314b97f36d9b4c545c3969ce93ed01b6571fcb550295eec1535af740. 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/NLFL71800918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6ae4592d2fcd89170cc2284fbb3acc7e76c47277bd958ccb24f060f1de5382. 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/NLFL71800919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b4729afdef92563d7fffa131447e706de9ab4bc9579104544ac0045ef595cd. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NLFL71800920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca4525f41498073de1bfa2c66e8c8f1d277b8eac88e8a9cdc0d0ba691be61c0. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/NLFL71800921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed77ee0c4a6b92571c638c179c155da94f15f6e37c42877f2f9cd274e384ba3. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/NLFL71800922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1375681aeacf9ecfda202e3cb52fd8ba2d127447e2e85779da0974eccdb7375f. 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/NLFL71800524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7de453d2a8d7d556716b3d9c05826bfd2aac69cef4ffca878fb493bf535c7d4. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NLFL71800924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1830d5649b23ed8dcbd8db474e22d79dc1d504df86fe6c89515e6ab29aa38f80. 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/NLFL71800526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25a48107d655b5b227328762a0455a75565b4f87f9998f3337a607082cdc66c. 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/NLH3Q2000730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbec384012dc5cd51464768e836e7b520f9aa648eca2f209194656186eb9d687. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLS762000299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee2f3085dda1f892208879e04daa526de3e9bdfd91cbaa4f31653fa28a85aa2. 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/USA561426578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f87974f5c933db8a6114bc7842f9810a09d4e13bf32dbfec1622f7954036afc. 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/USA561426579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8919f6d1d439772aa214703a21de974d0f7ac0abc477655b1880ead55adc7fc6. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USA561426580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ac27975408e3e0ede57826c9051fc9b859531579c494da211e3e4213f895dc. 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/USA561426581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1881d0f75d17ad5072f07b214af9b1e698c501c152dcadac58dc9f35f85a6b. 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/USA561279319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44b1764e0aff064b468a8b0decf2d1b6c2c9c0a769a997584778196011dd122. 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/GB8KE2156306.