QC may refer to: Places Quebec, a Canadian province Quebec City, its capital Quezon City, Philippines The Quad Cities, an American metropolitan area along the Mississippi River QualiEd College,
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 0xf16af252c47846e04e83003c459601c89b6ffb324517323a8a6bc6867338d524. 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/e085612f-7200-4c30-b271-9ffb816eb8ef.json and https://artists.proofprofile.net/proofs/artist/e085612f-7200-4c30-b271-9ffb816eb8ef.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 0xee06eb81890a13e8e322957de3cfd20c6ce8424f3eb24fa2073364cc77ee8e84. 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/QZTAU2378205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c053cb56843914bc5fb945bfedd1a01fe4df7c5d9a618be8eac00ec352aaca4. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZTAU2378206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefde046a89e230ccbfde98f4fab8a0ee0eab9edd57957e40e20c819ad5ffd179. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTAY2334749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3636038de539643b5c3fb66527b515f7b7a7deb48c384728fe4dba9fe89f4bb7. 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/QZTAY2318677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9d83dedffaa4dddb9dec5cfa67b5a003e5505b4c3f52a8c28864998b87544f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAY2319711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd891f802ff91ba05ba5aa9d0288951f32de1a025af916c9bf5300f91790f811. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTAY2319712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac78cb5abc2ac8a10e57aa7a5a99b95dd926b8bbe17adf92f8304ebe2c5747c. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTAY2319714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e28c843d7f091257d763c20a61eed9c792d11373d0251af798352382ee3896. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZTAY2319713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9076c17e85e2a4dcbc44f9927f0067d63854161e197498fb1880c6277ee9d461. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZTAY2334769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb63032abe3214e30326b0abdd9d04e59b29104c1520b3fae34502d8ce2bd3a. 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/QZTAY2320588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16abc8e4b7a220ac7ec403d2617d98fce6a78ba5e563b846ff931d828110c77d. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZTB22392291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b20518985040ae2cbd595f39c138c6344051f82056e8fa4d747385b077041f4. 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/QZWFN2308149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2241d5e125b85ef41bbdbb624043b80a5856373c5b497ea099e58330ad3b23. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZTB42314370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64984360a1d5cde820314b53d2ba1188ae0e7b8c2c8526df9c72dd8c4780356. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZFYX2457487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d8e0a28ff14eadc95946b82db9ec53e4cf922b43a8b8ba711f91341cccfc5f. 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/QZES72492542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241aa9a519ab7577df587329cd33c4afad1deb11e186c87474ca1eb728da6ff3. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZDA52416008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8fa6f10c1fa72c0ec51c0d2b7bf9d44b05863b734f680127df07a841b4488b. 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/QZDA52416013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe589ae5959a7b522fb16213bd6210f57d745e69c3b55a000cc7380d53f3941c8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA52416019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbde28a3b3f340e4c4d1da74a3ab84d1d226fe5e3f82098247897f81870f993. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZDA62422059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d0d0388ef42af34d2ef5b4c336e49cd001678d6db78daa659522b819af786e. 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/QZFZ22566891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b331ba8f20228dcc42c6f23182ad14faca7cf54d3a7b5538165e1455b77f552. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZTB22385838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5871ce7046fabb1df06a46e4cc0bc546db2f88fc2ec7f5ead80c3ac8e143d273. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZTB22391949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2180a15db57d36d3a47ee75711ae6622efdb0ce1d885baf3720e26cd8a35e859. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QZFZ72582924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab09e33d35ec9080d11e713f965e1b9ed36120128cd90d868efa9c2b4db9185. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZFZ72582925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb25f4bb9e25df9985b5950abf6d138b206dbb7ac6dfecdd8b27214a4000e476b. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHN62532949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efaf5321243d673ebaeffa783b45a7dd53b91bcee6a2d79ee506f1763bde98e. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZHN92537088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5fc909e47c83c00b4ccc35276c31ccf57460ff522aca6e98063ca584448926. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHN62535136.