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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 0x8ead4e5b64202f7d18f0c7baa9cfdedf08703b436ff5f3e1afbfb0210d51d30b. 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/00f21567-6e56-4ea8-9405-f904b541ed84.json and https://artists.proofprofile.net/proofs/artist/00f21567-6e56-4ea8-9405-f904b541ed84.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 0xfc752751a0d8b86935d1f3628a9c256f90619f1f12fba2ef1117a1364a7cc31d. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QMPU51266912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55bcc6c28d9d4fd5bf2da77a13cef24b18540230674584c1d8395ef3c22f4a8. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QMPU51266919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3659144782daba8b8be6c5c1c746cca785680db97abe5aa3f93f92a349a5a569. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QMPU51266945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e26f97218001bcc5debe83c442b87363582f6c2d59bafe9aea5a62d737da709. 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/QMPU51266946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbe5b3028f8c744fba53f1e19ea2b551ee2d5d2eba34b1572a4dfa963e63d8a. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QMPU51266865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1177f01e235607f2b53e801ffb0c4614787049592fae63f130de92d0fc0ab9e4. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QMPU51266791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c99c2359473ee0e8819f003b954e6db5f2059ad1814b7c3e04e1c4141df186. 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/QMPU51266795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b6fbc2b0e0b3965bb5a12a3909ab3ed3a440b12129bda03a26551f8d23876e. 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/QMPU51266908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc7772accd30ddab78f024316ed4a5eb84c5059c2d58f5bda91d9320e57ed3d. 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/QMPU51266851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6684b395511a71b749b9dd326eb70b6177df3d3c6f9409d83b84ed25e5598c0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMPU51266781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73616068fb2c8db0ef7e2f94baed4da5e22f9563f9d0fb9bd0825ee420d4c6b1. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/SMRUS0063668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265821d7cad15a1b2346b4137ef073793f88f10374fc4790bfa1230e7fcaf09d. 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/SMRUS0063871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f094f404d99e57e2d4d07bd19d2c95f46f893b630f951d413e1f9ea46520834. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/SMRUS0051729.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b1aa10f64b67729ebcf69dcdaf9644ece0a34f67099ce2a852cbc4eafafa8e. 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/SMRUS0067405.