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 0x8231f1ba56c68e6e2ae6858804d180cb7dc646ae8d086b1555c1748ab8b9168e. 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/24328035-47f6-4aea-b5ba-db96a562f19e.json and https://artists.proofprofile.net/proofs/artist/24328035-47f6-4aea-b5ba-db96a562f19e.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 0x8f8014b7a492b895283bc8388d89d0c4ff383fa5fae47fbe4caffee8a712eadc. 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/USCGH2114982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70239514881cf29ad31ca4b9e904120a879b949d2eeae0d1e5e3989e2ee2f4c2. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USCGH2114983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa633ddefcad9a5e8588fe1b50d23e50cd9548d7ede2fd8f2021edd186a5840b0. 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/USCGH2114985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef04fd06711685c9102120541e23ebd39b359e9b24d876bc3947c7e8645c8a05. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USCGH2114987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa614feb4e9c1bd51fad0c6f2becbe08f9ff9d81b5bf4eca88ff8756ef6bfe8f0. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/USL4Q2010377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d20def7207d8e39960ae78f07b148dcbe5df11778cd99d426bfc93116e39e6. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/USL4Q2010378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7c81cd0e3f0f2109d89bcc5e5eef81f2bda403efeff6fd17c579c21f907be4. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/USL4Q2010381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2ab398f94c54d37b901c4bca97a7fb61be94990cb0be9206695f2816177a78. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/USCGH1431011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0e0a55f29ee95375b16f909a6f5561528a1a30e3c485aa6eda91da703d72ae. 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/USCGH1431015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a7a3fbbae9505e39b87dfd094a7e37f7b944d1add50c57923eb1d90554fc3e. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/USCGH1431021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d21bc152360fc16512ccdb7cbd0bb0c11fb673c1c3deb79f62cb22501587e3. 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/USCGH1430271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ebec000e4af12694f8544dd90fc86dd609ceaff61ba22d5b824a25ba93fe92. 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/USCGH1430272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f9d4a364155d289c3d3b9d6b877b2001fdf2df5eea5ba391cd6c6b33a2dbc5. 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/USCGH1430276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x508cc7901af61b6f694c4cf4ed37c4886a75eb6f3b90364212a86b914e899431. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USCGH1430281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb24461a5e1c0797d46aec639cad51377c16b930e9db338ed270460f3ab5862. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/USHM91905877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969bd2e9f0b80960809e96a25883a56c72e0417b5e72cd8d8ba02a7f921d4866. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/USHM91905878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73186e7769aa3d58f0bcc0b096f15b5fd274c6642349b98721e39d0c4b26de6f. 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/USHM91905887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8817cc363f89f5a217529a24bb6c6c4d86676b3bb784a54f55055a4f2fa8cc. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USHM92422324.