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 0xb31d5e2939bb0233ee23623989833d0e5a6b0ac4de6a07acdbe2d7abb9787432. 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/cbf12260-18a3-461e-afe0-430f58adbca1.json and https://artists.proofprofile.net/proofs/artist/cbf12260-18a3-461e-afe0-430f58adbca1.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 0x2b81f7ab4c8ad3c10eb605d805e67b3883d401c83db1d0e105f3cfa3144ba025. 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/ZZOPM2117758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ae6db155cfc11d018d7958cbc142f31540efd45153495caab96787b5f0c5d7. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ZZOPM2230484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562aa16901a64523ef976da92370184a21db020c0373774301e816a96534622e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BK4DA2202739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a704f004dca80f6a2be10ced50b48775f51ff099f94a05ef52286ebdcc7878. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZNJX2346998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca85686783030691fffd9f80337010d40a7f47c9e88906df1f4cd6a163ffffff. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZTPX2376681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4478c30250f4d160d538c668563c5baf3956ef49ec4bd327a076087ac3aeb71. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/QZGLS2520865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312f6c135155c920e65d121bf9363788f5186c9871b98cf21436c0e684b34e27. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZNJV2585691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b8e85a361b4ebd4995141d4b0ba1db3c730dc871530085135f3d0140e7d482. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZW9K2448386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d913f8de6d2abdf091cc629f592209113538592243e58f3ebf81f79effe5709. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZNJV2585693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab609a92e7ecee858fb8344270a8d988a425aa029c3bfca2bf8da79ecd2aea4. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZNJZ2468656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e460398f4bd7b1b62022ee90ec054629c3e22477cbc245b226e8a1e426a595b. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNJV2585694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76462a1d05681949c2edcc9ef2efc7a58a3f345514ec537e6a3c38a80a0e530. 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/QZW9L2301366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4478c30250f4d160d538c668563c5baf3956ef49ec4bd327a076087ac3aeb71. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZGLS2520865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ed9dd102266397f9ed66c975eac8e30502b0fee9c000af42b00b060c3db0eb. 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/QZNJV2585696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30df271c1e84114fe1560eed16e697bb7be81149d9b81fbfe2e8c937a3e1ce2. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZNJV2585697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d3572c50c69ceabc6f0cd245401fa61be290f39bf71155d3dc82429b723d52. 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/US7VG2494628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6f35bc8cf0b9a56b6cb044a7711b3193d4e9f1d20cfb96155c44d262c81237. 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/USSD12300472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96962523d22dafad7ecfbdc15138ce187ec41a265cd826e7e1ab2b3093d0076. 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/QZNJY2293768.