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 0xf8c1f7b790f0a067122ea4759b20c1b5ec49c30b6ae6981b2f2a6d411ae389b4. 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/ef754d07-80cf-432c-9e3b-221b0dbb9ea2.json and https://artists.proofprofile.net/proofs/artist/ef754d07-80cf-432c-9e3b-221b0dbb9ea2.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 0x1287879ed395c2461ee723a1133d98c49518613643ef9f79ec277d4e94694a42. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ITUM72201473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e43b1e7e022a962a16eb5b2ae937c4ffb7d593ed2225964e06ae92f0d08c111. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/ITUM72300580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061909151ae4a81f6d041e23d5cbced5bdaf2897a43962c55520f4e3b8ad6cee. 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/ITUM72300682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996fe8e3c74a35fbe3962f5c7673c73e78c760f94a56c11926f0dec77bdd73d6. 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/ITUM72300878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4141d5bbf97b834e1113e48db395ed4aa95c508b15fbb589a2a22f36abd927. 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/ITUM72301037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53417b04f9b234e5996453101cecfcf0684d08e2cdcf498975195f498f13166a. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/ITUM72400647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeee37ba95bf901db1658f1f80fc72cadc809224a13f382ce911bfb924f3500f. 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/DKUM72400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bebf3cacb63c8d591d48b9eeadc9eb9e224762e0c6e37f4225e6f6a691527df. 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/DKUM72300599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21a841dc82461784d9af5717dbb63e156b93894f2c541b85ff3a90233a7c92c. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/ITUM72201651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1287879ed395c2461ee723a1133d98c49518613643ef9f79ec277d4e94694a42. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/ITUM72201473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1287879ed395c2461ee723a1133d98c49518613643ef9f79ec277d4e94694a42. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ITUM72201473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7455ba438f9b55d0ba07ac49cb505e01462fac619a34fa66b016a70f0f35e6. 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/ITUM72300432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6eb0949255530e50252544e268357c7720e79b21f4d368ebb167df116ff68e. 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/ITUM72201951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21a841dc82461784d9af5717dbb63e156b93894f2c541b85ff3a90233a7c92c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ITUM72201651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1287879ed395c2461ee723a1133d98c49518613643ef9f79ec277d4e94694a42. 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/ITUM72201473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e43b1e7e022a962a16eb5b2ae937c4ffb7d593ed2225964e06ae92f0d08c111. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/ITUM72300580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7455ba438f9b55d0ba07ac49cb505e01462fac619a34fa66b016a70f0f35e6. 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/ITUM72300432.