thumb|right|FiiO K9 headphone DAC + amplifier FiiO (FiiO Electronics Technology Company, Ltd.) is a Chinese consumer-electronics manufacturer headquartered in Guangzhou, founded in 2007. The company d
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 0xd612bebfd20e132f384d1636ef54927b997be6c33f700934dfa97fdee5df4464. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c97b7c74-a5a5-41ac-a54a-eff79d7409cd.json and https://artists.proofprofile.net/proofs/artist/c97b7c74-a5a5-41ac-a54a-eff79d7409cd.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 0xad849eb74e03280f6686f99264ec4298f99ad0352580b59deb794a18dd2e5f51. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZHNC2041441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40307b9ade508032bbc778673fd57e89bc5decd599e7fb639b1be25c0f8d4a25. 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/DEW922101628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad849eb74e03280f6686f99264ec4298f99ad0352580b59deb794a18dd2e5f51. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZHNC2041441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2cff56a3a806d2999370d969e35051e4ac230f9e03cecc669442d67c1fca91. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/DEW922101645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f64833b4154388476c6bf488ce4327da1696794f1cb4d92666959dbcc1d0f09. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEW922101653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d59dd239310971e5a8988a6e9cbfdfe60b865ed26538c73676dbbad885fbce. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/DEZC62270396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3e4f2605867969f266bf8a9abfc8d53f26960f3a21ec3ef34ebb04995be1ff. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/DEZC62284433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946f18179c96f4baf329e40f0fa2d209af5ae18c16afd71fca06684b2db59a91. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/ATB152300345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fc3aca9c991fe60edb78923d99948ddc68c0ad31b1497d90aac502d91127d9. 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/ATB152300498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4e36c3effdca77aa75a64d91feb29d0fcf1d01a6c4885f8d8e1eb7d693481f. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/ATB152300308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986bad650ff815e416fea8b3c7e56078b27bf7e8140791248cfd3596878e0940. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/ATB152300600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc78745ea103c2f85915ecc261b3dbd81a97c94ddb848173bd2b6a47469e42b. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/ATB152300224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a979df4e77b3e16d905a4f2a074eb0c93ef603485956e2698082ae36ad8eb3. 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/ATB152300603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0182604544661b0bf740d8afc684b7db502d1da7e5d398d8e0151a21a60297fa. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/ATB152300587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f61972078617eb164bf768e7f576627d52a25c5d4d55347ab622e00ef656a5. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/ATB152300606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471b83d39b3e4716655124aa0591a90b7f14f631d1a7efae033c29bab2d35b05. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/DEZC62408432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ebe92f37f9005191f3479a2645f633b76dbdfb94dbdecab984b15ed357b020. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/DEZC62415673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c347e57b01ac5eb0ef6a982817d5e9ca50cbde3095be07ceb0dd1a3fdb56095. 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/DEZC62437297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ea0491476b56d772f3d1fbb96ee286c3044bc945e0d5ae222425d0407d3a5a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEZC62444866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc59c5451ae176a297dce40ced690c5b7782f64b3ceaa3e46fa1fd7ef94c9d6. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/DEZC62450742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c347e57b01ac5eb0ef6a982817d5e9ca50cbde3095be07ceb0dd1a3fdb56095. 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/DEZC62437297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ebe92f37f9005191f3479a2645f633b76dbdfb94dbdecab984b15ed357b020. 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/DEZC62415673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b28eece60026ef49286fc0097582fc7147b33bec6f6880da72cc5784e175430. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/DEZC62454392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e316a0c70837e4e58f80c555ea840ffcd50af59056ded7ec98c0e1f68f8c8c6. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEPI82512773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45bce6a8468d6d42dd5db26dd6a29b66aa6c39c092be2896adf08cb63062ad29. 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/DEPI82541823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e316a0c70837e4e58f80c555ea840ffcd50af59056ded7ec98c0e1f68f8c8c6. 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/DEPI82512773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ce5eb3453eba84f995f2299c79511a836b156b775609b9244033b49ed49d56. 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/QZK6P2048685.