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 0x5d46ae53008c485351a41b2a2849e50b8ddb895e57bc1ed64b1d545a0775f7cc. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa04eb77-995e-48ff-8310-351b56fdf27f.json and https://artists.proofprofile.net/proofs/artist/fa04eb77-995e-48ff-8310-351b56fdf27f.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 0x73e139b25490d84812b54cbb9824179acf19d9fd63ada38696dd7c90aa834b25. 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/USHM91755693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c47e2c02352bd1f9ae98732f0f8cda6bea535df8152f979405535a87a2828d. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USHM91755694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5842936350464689cab36f71cd0d984f0824a0efcb74b70ba3d4d4404be7d730. 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/USHM91755695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7088af470577c69e5e61e9f1eeb8e2ae5d407fc88209d95c4dc32fd7a5c271. 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/USHM91755697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9127211d38d172c07368c64ef5b33f8c7602ae624b248cb3293860f0081e407. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USHM91755698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39be5e466b859169c19c8a5c39e8b1ae3e26504d186ca26ec6d06be60bcdebf. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM91755701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b910ceec9e8f947ab35c13bb3f81615ce24f3d7a48a49283c417826111ab44c. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USHM91755703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4b034de77195411d8acfe5cb9497e3cf492dde2a78077009e99b28e9bbc1d3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM91755704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd08fb80d4a099ba720e95d1305c883ad10b5077a6c4273555c201109f5fca3. 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/USHM91755705.
When Leadbelly Walked the River Like Christ
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445d62a58caded2cf761db01932e8d7aa345567035cd31b30c48fcfe468283a7. 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/QZWFG2401843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557bf3bae4589b012336932718716f954b562101bb521667a76c3be1b9275138. 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/QZTBE2404431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d3fb5b59c3d3c49a82dc4871fd1abec5916dfe4ab9f47f10ba63474d8048a6. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZTBC2466354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14244b16ee1f2eeb2ef116be2752f3fbb46b0bf4d49e152d6579220b3e1c2227. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZTAX2434191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4e1ecb9c222268c0750bd5eeeecd7940e3aefd55965286c9610cc2312d8ff4. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZNWS2413264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99d5e12189a25123985343e7cd12a186880fb82f0a0343560359b21784f766c. 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/USL4R2062152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b692342e4533786a5e6f856240ff47b65b77c5b356ceffe45b2eeb3762aec6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USHM22040100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01ad83033deaea61c396ef1ea8b87dffc1fd9dd3a75959409513db560d11749. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZFYY2001314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92f0427f3f16c64fa4ce8b35deabb0f56b5a2223887bfadbcc3b41d211a5bfa. 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/QZDA71985082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c9ce241471e42968ff68846fb3470f2a8701a2ccbcfaf3fa6763bc7edc6dcd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZ8LD1996719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86387dc691f4ffe215daea2d9e2274941715982d3953f1ebb665ed05149d272d. 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/QZES71837849.