Zikai () may refer to: Qidiao Kai or Zikai (子開; born 540 BC), disciple of Confucius Feng Zikai (豐子愷; 1898–1975), pioneering manhua artist Zikai (singer) (born 1997), Swedish singer-songwriter
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 0xc2352446cd4fd83cb3fbddf522fdb26601977ce1b9bf0aaf44a9385c9b9e0315. 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/5a9f96cc-9f23-4834-aacc-a1354293c78b.json and https://artists.proofprofile.net/proofs/artist/5a9f96cc-9f23-4834-aacc-a1354293c78b.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 0xa0887b5b6c457bc3bda45946018c4e6b5aad03b964b1473c1f6deae9c58120d9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE6BN1900401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67c702ed861057357d6181709cc7eff166f879580eaa3e2763f10291332f2ae. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE6BN1900501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d616fc57f6f2e97458634fdb00b1b7d441c99f694104514533442af52f9e8d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE6BM1900701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11ddbd554bf18b0510c5a7c2e99e77d38617c769364f3b1199eceaffb97c4ca7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE6BN2000101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7061926e353f98b9c575a0b3c9f01a555d1b98ccea4dbd8ceddb0ff54596b1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE6BN1900101.
Champagne For Breakfast (Stripped Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5956e6d20de31d61e363febc812a705d696a178442b6537c3b7dd54e7c5ba94. 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/DEE862101336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3003552d7f3ef1a6d85a0952265212967ba16a6204b4515694c103ed2bf2c09. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GB2DY2300206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e25725cc6d529f640fca0c976c0bc77f8316b0643628072f8d6ebd251bfeb7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE6BN2300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7648f449290356a6666added4ebee3c41d28b216c20906f07e22b8c0fcc23267. 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/SE6BN2300201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3764dceb88cf3908a2a63117367aa9eccdb7b68d897ce0fad844950979c21e76. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE6BN2300401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7648f449290356a6666added4ebee3c41d28b216c20906f07e22b8c0fcc23267. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE6BN2300201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f503dad86c003bad29113a2ce3ea05a94a3eee694e87f7d2b2d47bd66159d9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SE6BN2300501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91396df8268ae9fb2d39d862883f03db29685c31076e769e1054cb8b9ec0fde2. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/SE6BN2400401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7648f449290356a6666added4ebee3c41d28b216c20906f07e22b8c0fcc23267. 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/SE6BN2300201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe38c75dde40dcee96c72cc043ea0ec821f2974d9f8f7de359abd49086526f4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEUM72101059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe38c75dde40dcee96c72cc043ea0ec821f2974d9f8f7de359abd49086526f4. 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/SEUM72101059.