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 0x91ab29c979fbe22d18107a63ffa46e5d2d4d540c7c3093da3abfa768b1294c8e. 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/f9163f1a-7a6a-4b5c-8da4-6d38b4a336bc.json and https://artists.proofprofile.net/proofs/artist/f9163f1a-7a6a-4b5c-8da4-6d38b4a336bc.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 0x375c2180c12b0f31860b1e1b2c10d1dd2a765d056aa887bfda54cd462cd02f40. 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/TCADJ1793412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91a2d20679d2dfc4a7143a0a292180efe41823a78e6945b43fab039d74b1a61. 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/TCADM1847995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e9eb882fbc4b869c429acd0c13cb4cec9d89165de716a34fd5f452de1271a32. 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/TCADM1847997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ffa87f90466b6ac1a4bb7695dabb5644be14dd71f9bb7e025d522f3cd1603dd. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCADM1848003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21b3d1d3b06993484d00744cc537f414f4c38ef3e3d10c3aca1730bd169364d. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/TCADM1848011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7be7457874baf820c3f4c644fe5aaf61860ad1c77ad14848e90c62256ca4d33. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCADM1848018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c06fe327d992528e15dfd271fa59d986c308993b9787f31dad21ccf6e3eadb. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCADW1800547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43dc4f85080b04161e6631970fe01b3da3e55d8cb6941f6b887798ba00cb322e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAEE1918444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06347b5679df32d588f798edd26f60e02a6f38966055bae6343648963c0aabca. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/TCAEE1918450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f8e80e7482319b8a5f8223f74df0fb0603dbda667aec58b8306d2489d1c01e. 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/TCAGP2235497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb920cca1f56bb4057f3fcac7e3dd7ed2a14289a4a38c637ede188f280d331c35. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCAGP2235512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9a46a89ca65e8300233c270e745c873cc445c54960b73a646b9c6a47bf5b96. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAGP2235513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb8898c6c4a971823f0f1829e597a349abb5302c42f2f4c696acd7397a70ef0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAGP2235525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7605d25af841369fbf6d605b6469172edfca1aa459f515ff9494094e2820cc4a. 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/TCAHD2369503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d742da2f92aed54f9f1848f3345c27a22233cc6eff2cd945f486cc98c3f36b. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/TCAHL2313709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e92dca27fdf201a8c41942cd10eb596040bf584af6e57e11ca32c3d1bb8a289. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/TCAHU2459932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eacdd264e41b7fee65fd9e24c908e99b830edcd1f09d91ed4d1fd1e42514fbd. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAIN2428629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefb4cf9ed0f54bbe8233c4cd122ec9f4ef9e6db27f4400e41b66cf930f097e0. 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/TCAJF2568630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d87e3c68d5851d6d47f43633bd2f25f6b226d302fc7d5d505b0d3ca448bb988. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/TCAJH2510815.