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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 0x0afceda3472567523ac06db875ab8675ff88c881bd309c4b53513cfced8d13ca. 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/f0281dc9-c933-4f4e-9c7c-287658e0d905.json and https://artists.proofprofile.net/proofs/artist/f0281dc9-c933-4f4e-9c7c-287658e0d905.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 0x4e27d5782b5f19495a5ec2fe77c3fa5f742256e8f63d755278686f2a27104fec. 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/CH1140400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35fc1c09f49143619dafdf94cb6ee98788b7106406a9ab6cfbc1136f5b4085c7. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/CH1140400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16395aa8e9d19128ed324ced34650062815178426714bc34f528761bfd06a35f. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/CH1140400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd7b0cc0948e173b9db2b411bf74d68a22f9d37f9780040931fad5602bbdc0b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CH1140600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cca51a9a8e5347c7e996081afb74dd2b5d027a4bfb151f27d0853c95eec3a76. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/CH1140600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cea3bad132f621d943beba355fab2f040937d052e00557545bc138063b86dd8. 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/CH1140600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72025ae86a9d37adfb49d18732e99ffe3f265f4b9f0b6deb4e9e4005a3e95dc7. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/CH1141600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9d0c5925d70a75e63ce4370901ddae054243d3b2b0c836b8a04421ac4a0056. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/CH1141600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200e45a1097f518044cc0dfa150b0ede03c489d2f7ffc2855c78a6ee00a1e13f. 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/CH1142000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93acf3944ccd9c80439997b365eef7cf7bb474f5680e6904c020e4f52603f655. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CH1142000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d72ad42041b1c400089f648887dd6b1fa0a707e0dc72eea30e6515824aea29d. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/CH1142000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be52a86d28bfee6fba6e0876bfc8cdc99dc81a54907727e44917ad7c36a0697. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CH1142000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526e9b2d1b8e7adb7bc89047278555f37f49e20c1802265a2456f51193ada0ba. 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/CH1142000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adeacf89917ddf032ba66b3879f4cd95e124933deb9038f63285c657184143f. 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/CH1142200001.