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 0xa51c284980826ea3484926f96cd171055379fd749ebc2e32bb370d33fb516b98. 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/87efbde0-8d2a-40ee-b062-6a89900471c0.json and https://artists.proofprofile.net/proofs/artist/87efbde0-8d2a-40ee-b062-6a89900471c0.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 0x679638d689916f27662248e4adc1024703edb7a8c6988658ff60f54252808b9e. 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/HKA610100178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2b1f93797353ba19da8a29f2fdf4fa397477c176766f34c015f86f7ff2d88e. 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/HKA610000767.
Graduation Tears - From ”Chelsia My Love”
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67411d8c5c7481ba75359c4bfdc8fed511feba3fa673dab6face79058183f237. 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/HKA610000768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c126a1f62245948fa3674cfb621c22477ea70d50e587a37160eb1988d6900f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HKA610100176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5825c1960a5f2c420e590055e0f6bce2cc9e6b91cc90bcef59224f3e8c446e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKA610500061.
Starting Out Again - From ”Chelsia My Love”
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab615b37d83cd48f1d23ec5420eecc9c2fb0026299983069a3989350aedacca. 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/HKA610500062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda350b6d462c3fb601c0eb03c93df2481e4ee93acfd30abb7cdc974447d8e453. 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/HKA610500063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f7eca8293b2734c8ccfab8485768303d4ed0f96f35d7c11358ec0365ee09d8. 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/HKA610500064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4a89807a93c1b27955fa229c20f6cc2507811aa8d8d208f6bce0d807cc6ff1. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKA610500065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ddd9f35bc79fb2a9d49d5d5caf1c5ff99f1b947667cfcc04ef083e417a46e6. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HKA610500066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b53caaf4a40cf7d8cbe8a87a2ff0019dd878373e4c576728d69b00f96dd4d34. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKA610500067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff90c8c32f32bf15814af68404a09baccf6aa54dddc514208138233522fa2f3d. 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/HKA610500068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f20cc9375230cca801dcb39d1cc1f775c1bcbe609caea3c17fddea548d75a35. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/HKA619900273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc1554a2e401b029af3dee9f90ea438d6e62fff915c3d3f344125e69f8813bc. 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/HKA610000754.
蝴蝶夢 - 無綫電視劇「殺手、神槍、蝴蝶夢」主題曲
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2dc1d20318accae6d52dea78592f8689b62ff7898ec5786582e7bf58c49b7b7. 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/HKA610000675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb889288ae1fed76fb0910dace8a79eacb0eb35f9a2aa0938fef8aab62588c6. 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/HKA610000859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f29bec26ef35a90be374b1ed915bc56a76541474fe227dc343aef6e89273f7. 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/HKA619900488.
MULTIVERSE OF POLYGRAM 55TH ANNIVERSARY - 陳秋霞
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f29bec26ef35a90be374b1ed915bc56a76541474fe227dc343aef6e89273f7. 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/HKA619900488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e15f06f2ec8df2101ac290bd6d3bcf83ad3938ebfe3f394856a8d4d9f2d7441. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TWDK58204011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925a85ff8a1402ea3ff023d190b835fa38e0e740ded8504eaf466dbae6fbd7c0. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/HKA610300666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2b1f93797353ba19da8a29f2fdf4fa397477c176766f34c015f86f7ff2d88e. 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/HKA610000767.
笑傲歌壇 黃霑傳世經典 萬載千秋縱橫特藏
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f29bec26ef35a90be374b1ed915bc56a76541474fe227dc343aef6e89273f7. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/HKA619900488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2dc1d20318accae6d52dea78592f8689b62ff7898ec5786582e7bf58c49b7b7. 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/HKA610000675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f29bec26ef35a90be374b1ed915bc56a76541474fe227dc343aef6e89273f7. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/HKA619900488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f375e14a0e8d457fee5087c041e00b9b46f47c2b6b78db5186150b4eb024cf. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TWDK58004003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2dc1d20318accae6d52dea78592f8689b62ff7898ec5786582e7bf58c49b7b7. 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/HKA610000675.