Dr. Vivian Chan is a British-Australian serial entrepreneur and businesswoman. She is the co-founder and former CEO of Sparrow (formerly Sparrho), a London-based startup making science accessible by b
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 0x486c029f8671dc7878aa6df9116f9bfb6d9b8deac1d9feefba4914d63ad723c3. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8825e457-d979-453c-9a1e-dc3ff2a510e2.json and https://artists.proofprofile.net/proofs/artist/8825e457-d979-453c-9a1e-dc3ff2a510e2.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 0xc31204fe0f314f9c80a52cfdf08d72d6a38eb886063d14e790ead84397c4e94c. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/HKI031300054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc92332094fadd717c8be33aee71a79513899499d7a4be20a2a2860d72a1971. 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/HKI491840106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a84035c347c24fb3540743a413c434693a1be21d922e3185fa73ba353699531. 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/HKI491840104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22d147eca1b7ea4d3d8f25d0cf12d10690d7d0974fdc5870a9f11c8e77e38f2. 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/HKI491840101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f83a8ef2644bc1d9aac234955109a38b46dc05374fe92db2414ca84be5102ad. 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/HKI491840107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f600a7ecf3040e6b1f5dc5c198cb78590c4b6d944ca7e34484e780da9e675b7. 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/HKI491840103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4d190ef0fb909b57a6a069cbef053bc940f55b46d6d2a2681614d3855d9a0e. 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/HKI491840108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d2d5a4c3ef0d654ae7e1a97c630a6ac80d8df9043e281e73a9861e32df7912. 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/HKI491840109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213169f200b36288aecd9345c7e4953322fa988f8091aa00931f752985f98523. 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/HKI491840110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35337dffa99971a2c6adf81df768e8f7e7dae42287ba8d2271f451acbca712d5. 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/HKI491840102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836b6890b98281cb7438322af8c7294574c6f126884fe1699e03ca466bb04d0e. 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/HKI491840105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8312a70612d061d3752213f56afae8869c6ef4bff85cc8ca0cd0aeb6283fea. 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/HKI491840111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298a02fa3ad144d07cfedae780ec6e06dcb6030e8c3136804ae6a4b9b2ff3e73. 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/HKE511800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c87695ecfdf386cdd33180fd929eda0167c4bb22a315dd3a49e77c83c47bb50. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/HKB661900095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a3f2d0bbe54ce7fde780f85d6656964877b94df26292391323490789c70147. 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/HKI032400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc136590e174d44e94be17874c19c47a073aa14c1174236ddfc3de79aee150a. 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/HKI032300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa18d46e123e381e250d847b95b76d2776ee2f9ff54879c228b9a5ee4303af8c. 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/HKI032400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78582cb5e231088b7dfc312665a9df6d8ae9fac33f9b252b20dd5b96574d184. 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/HKI032300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66318bb9e3cecef14c08888fafbab79f7721b44f748ac99a5b6a18f43f9c7824. 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/HKB661900123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d758fd300aed3242ec5d6f27a0f3f13fbc953b4afda8e1e1496ada5c22f68b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKI032301002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6639217b30a1ceed52f4cc8977ab013a7d3f7b24d05e0b87e48b9c1d8a1f6ec9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HKI032400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3531310b40d3a2d85f168199cf88969e16fbfe90e5f4dcdc3a0e5c000191548. 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/HKI032400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39950aa324f7d600697ae63d0da34b2e61599baf3b0fd1b3c92cf1cb76a281f0. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HKI031300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2462e29ff966918d4c92a6afd34c735e405751822d98baa898b4ac276be713. 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/HKI031300061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778140d0edd470591d2fe34bbf799f80b6df4b0d877de4f081e4b1d06901131d. 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/HKI031300063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3531310b40d3a2d85f168199cf88969e16fbfe90e5f4dcdc3a0e5c000191548. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKI032400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a3f2d0bbe54ce7fde780f85d6656964877b94df26292391323490789c70147. 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/HKI032400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1040f1aaa9774f12a91321f61541ae732ab55fd32fbb3e7a27e7e5623ea666. 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/HKI032300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e6e1b4b95fe7d78c00b95b22c478be6d202727254da5bc327c7b80af58e298. 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/HKI032100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83e799178df58173209ef608412c0ebf951f52d9c602db97bfc4226d71f99a7. 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/HKI032200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe383b5145e6d98da401a99d2ddd8fa46042c5dbe446d720e53cc28c05cceb3b7. 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/HKI032200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c87695ecfdf386cdd33180fd929eda0167c4bb22a315dd3a49e77c83c47bb50. 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/HKB661900095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dafe855f1b9ddbfaa254b5b893fcf9841cfcb6cf2271168f40b4fbe7a47ad9c. 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/HKI031500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf09c8967ecf871fb433964cbc87d1c3db5114f4c9f252781a60da92d649fb0. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/HKI031500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad3da13ab0d5a3be1c9571ad37571cf2a84a2a204363c52aefca63d13020c55. 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/HKI031500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002e21f7c56e91d3a22d69e0aa36efb863b1add333dc4d1ed46c8d45fe922d5b. 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/HKI031500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78a842e2f8174edb8e1a996015dc01ef756c7f85e308edf31bce27690da61bd. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HKI031500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a768bdb603c6227cf671af51f6dd31659b5070e36c14b84b30dbf870dc6a2f0. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/HKR661900099.