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 0xb7ee593cbec6f4a541a7e9920014cb0a57bede0cd8d9ea9ca4960fe13146de81. 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/7e529f66-ed8c-4335-bfbf-e53f2536ddf0.json and https://artists.proofprofile.net/proofs/artist/7e529f66-ed8c-4335-bfbf-e53f2536ddf0.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 0xc85279167f6a73a651268ad36ba7a4c6a7303b51e2c8380e348d591b1fd425d1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CA4E31100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a069467a8170bcc15a0d07a485e5db981e707cee75f95991cfc6e17f3c4a17d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CA4E31100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81299e95bde7bb9dd745c0a7aa93c0e9166920010d14074b1306e701079b30e4. 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/CA4E31100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff8781d00ddac716126d96f567f7b5511bf955769da6b92cafccfd5154d59ff. 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/CA4E31100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca9620b93af661d90759dc4d6b2e6cba4b08f5066bbc30a53df4ba5bb16a1cd. 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/CA4E31100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed7092e7f5b98175e795f2d0c31003feb04a62e386d5c634810d812be42d110. 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/CA4E31100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfeffeb5b074278b51330aeaafbb426e8b823a86024f1130afe426a8e3bd0f3. 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/USL4Q0706569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa570702af63080afa3cd88429ad5faec676b4a6ac4799f5e03a37d978ff5df. 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/USL4Q0706570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b13145c9f65c973d1c10fd9a74e083caf017431f8ae473b24811904b5449c90. 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/USL4Q0706571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf650b5e1263e1e5b2b967fbe2046ab0f95d832f3c9a6bf10c2323062b3ea4d1a. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USL4Q0706572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18c3a26201c17caa2c4107bda2b174e60aa4bcf4bc71aae6e3727f215bbb61f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:44:43Z), 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/USL4Q0706573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36df44406359f21e25f5e1d2a84b7b6efe38ab0065fd7ec0bc3abb476b84450. 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/USL4Q0706576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0177ef44cb097abd4c662032a2a7b28c20c61a1d59c2ad55f99f0f2768b3235. 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/USL4Q0706577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1278c622f38324d9456f69d1c0b34496c0dd36d291604ef552b4ec0ba6a5b06d. 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/USL4Q0706578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ebaf8c8a73b58377a549190e74aa6842828f76eeadde79fe4845b45d9aba15. 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/USL4Q0706579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf43b0bbd47a1f5eafd6b02fbbaafeb01a3d97ba0047a57cbbe24f97ef5e45fe. 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/USCGH0554496.