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 0x7df3701d65643c4dfce1b371c3e54688b66d31b511ecc0e110c140880a790425. 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/3c740a3b-9ea3-49a9-a6ee-903bc4e4250c.json and https://artists.proofprofile.net/proofs/artist/3c740a3b-9ea3-49a9-a6ee-903bc4e4250c.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 0xe335148fe74cac1025d27244641a2c9edbab23333a97bb826066503dfc31d13d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZTB62273610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dfa94a874973be21357635b0da289a58d3e65ff152e2a6a41b9fbe1cf37da7f. 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/QZPLS2284106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86766048f0cf1d9658b7e99d97b323fe4b123c29d5af6f873db3ec9222602886. 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/QZFZ72405940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34516e8acc3e4f5d3676f1a20d9665307f167748b68446c8ee6fd1051c5f73e6. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZFYZ2457874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453184743c7dee977250e4e19ad9ad6f7904b9303efbf57877ddf03fdb1d5bfb. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZK6F2384794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19948332d8cea28677dec1af222a7bec67553589f4c02a1d10d66a15eed97648. 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/QZTAW2211501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc0a7ba0b73cc357dd49a7d74622ccd8718ffa5499d8ec0aef2b4ecb3f035c7. 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/QZNWV2207913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29cfc819a1c35b37515857bbeb20f184b5f94dc7873189e76dc192299d01b597. 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/QZHNB2280497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7efdf57dcb1368adb05c32fd844db5d18aa00e80432642d14c1b00c17820e424. 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/QZDA52261752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647395c7fdd50688317d6f53c852b00a5deffcd885877409d02655ad36887d27. 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/QZDA52261753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3942b2b0033905141b30dd8ab9c222e67e5eaa0823e8592fd8fdf302c547b7a. 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/QZTAS2138394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e36f683eea3640a6b7e6973f7f29430d102c4f5005906bfac1c2bde8bfdc62. 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/QZNWZ2141164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7009ae49fca29fef2cfff424f0a279b307d20598730868dda3f3826f39888a0b. 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/QZK6G2135776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf27d30631e71e78fac9bcb9ad46de1c0a06d1518151960f180002ef2e8237be. 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/QZMEP2168485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6450c2c0e617b9d4cdad5497af91d69ada440b4952601aa27ac5d3258dcd07. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZTAT2200333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3824e6526e91949c77b1001a9d7107479adccf394b1b75a535d9292fbe43019. 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/QZTB22286452.