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 0xb97ac8eb9ca9a4e3c35fe3235fb50ad555452fe213f91bb75951f4908d3ae1bf. 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/fcc0d815-0c1b-4e90-b1ae-7ea1a6c4ced6.json and https://artists.proofprofile.net/proofs/artist/fcc0d815-0c1b-4e90-b1ae-7ea1a6c4ced6.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 0xd973930a6f1dd45912e35f053ded66165fd247d7ee9add75a1e08d3b2146883a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NL1AP1953339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f1fcf3ae66f3bf6786575df7423dc9f379810c14f8639b34271a691519d0cb. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZFZ72090978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169405706e3b1fdb05f2f0a2b546e7fb9c04502d3fd64aa3c59263641b4a43fd. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZFYZ2032673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf32d23560dfe6df23ee670938153244079c2def89d749367fc9f6c5b42785f30. 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/QZES72029231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99a0e69de9680fca0f22507ca7b61e33fbfb6c6affa138cb9a35147e0ac3e0c. 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/QZMER2123167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e0abebe829105f35b58adbc4568eaf4eec3d89b61cb2799becc35e11aad3b8. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAGD2277061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd830cad677aeced424ce74416d11906acf8cf8e3fcd0c49ce88e486100dbb0d4. 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/TCAGF2277099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca1f61eefa991cd17c09f05273103fd2de09adc2b3da7e4f8ebd401d2f7e3b8. 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/TCAGF2277147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d7066b730cbb664852a0d19a7f3fc7293da56420396c83d971cb88cebd8afb. 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/QZMEM2219670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ddb3b48d97957041c050710460700696b1734890407795c0c8da19b32c5d5f0. 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/QZMEM2219671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67dbff36174d50f151184480c318fd732421ab0b370c113cfc6292fe18efc500. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/DEZC62497801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f769f5e8ef1bba05d75e295aa54210a8f3aa33d8f807dd866f51b82a6db5f1. 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/DEZC62408533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69aa41ed9cc0b5f276164afe462d3714ec3b0f56a3dd610ab02f61279148f74c. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/DEZC62410676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52dfb55e3c6ab12c1a0541185711b0593e5275d7b70158a5cb44113076f47a13. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZFYZ2447997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b534b77a51c73a1a9a97f1873507a82c64a8784a607ec913b12b8312d76cdad. 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/DEZC62404283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3c483c5fa2d2fe4c9c73cc44480342de4768301786f0d8a0247b1e605df129. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/DEZC62456722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x446015878447c63818fe7fe1e6a5ae3d0ed0ef9850ceb68bdd9fbe06e069e733. 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/QZK6L2361420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61c32b40fcac7f2a70c3605544b29ed432486b2b191f69b8bc7f9eefa30f1d0. 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/DGA092361161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61c32b40fcac7f2a70c3605544b29ed432486b2b191f69b8bc7f9eefa30f1d0. 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/DGA092361161.