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 0xc2a5674da6f9cb84fc1e6986ed0440bfd9ff0bb3685295c5a3da16c241a6f507. Chain 2 (Bitcoin): anchored in block 953696 (2026-06-14T21:45:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/727bba1e-b40b-4eb0-be3f-ce2799d78d82.json and https://artists.proofprofile.net/proofs/artist/727bba1e-b40b-4eb0-be3f-ce2799d78d82.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 0xf12db84ae122f44f4d62e0023c99af36fbaf9972bd9ef1fbe96214e8136c0c1d. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NL4DU2000149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd477994b529d81ffbc081905c4395fad57b1ea307c75cf7ff9335fe7e320398. 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/NL4DU2000153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7c1cca41137c5a67009cf5c90a410ffe1c7f290cda92f504938520c4c29a68. 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/NL4DU2000154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcf846d26214c079c618556eaaa3f77fb76684affb72f0d64e018c80b775120. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/NL4DU2000158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0b9f0fc3a2a9d0d14aca8ded3d3e4b98958044842114155c3fa1246dbe98d1. 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/NL4DU2000163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05bf6912a014c32a7e7b383c47f2a547d805f25c22d950da6cbf7abe1b2b909f. 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/NL4DU2000494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52eb494a614cf295777140848f3cf9fc9ef443f127423655cc85c4bb5636fc3d. 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/NL4DU2000498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c050d95a2f5492921c3fdd50f23f3285a61f4374b37718b4b1e5abafefc1f48. 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/NL4DU2000471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9273f2b670aab39cd3e20dc83435caefdb5d25bbc5e19c69002af59f53344721. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NL4DU2000359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf659cdd1d6709369b96dda4ba8147da5991f75cf1ef01c75ec066e24e3494b4f. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/NL4DU2000230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe714664b9207abeeb073c1902e82d29a756259b9a93bd3448fd806866ae2f30d. 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/NL4DU2000511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d91663b2a2699501712639847a56bb57d6df447f997e4fedfc4e278bdfaba5. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NL4DU2000420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf043dd8302f67796ba5e8213ee79b8f910a83f5d35bdae80b240867209993eb. 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/NL4DU2000422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5620a3469629aad52b238a4c77067976701ee60d8004a9d5e2f02dc7af2e7099. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NL4DU2000341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77e1ca2dcc16769b82e4244a4b44fad7dc918a182cc4d95c1342dbfa35800e4. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/NL4DU2000344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231fa918472979159ea3fe483b6193ebc891a6e5b4aa161837881ae879ae928a. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NL4DU2000375.