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 0xbc2ac23bccfcd1e6afb89a2b4a74655219b9dde88fa0e9e9cc38605233cee1c6. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d99ac608-c7a0-45f0-9147-db749ad52876.json and https://artists.proofprofile.net/proofs/artist/d99ac608-c7a0-45f0-9147-db749ad52876.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 0x422ad6aa702f27e4eb18b0e55db903a5ea7db86e5722687cd79d7b5784eafd5f. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZTAU2537269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5539d59affdec4b436119bf00f415f485580979d5c66a30d880b968a5c57c8. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTAU2537270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cfd96f047bf1d94b0cfb295cab32eef7d64abdfd4b131767c186ec2435322e. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZTAU2537271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd799506be8043a98dfff2885d0f2b11c411c575d936d8b0cf27a92c8060d85. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZNWR2525047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb18843c40fb3b211eaa8f87a689b8b2b5ca6c8c11b7d91b77e18e2ee3eb026. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTAU2537272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5b4cd8ff7f5be7ba0c8fc8e9afdb51cf22ec2024bad174b6c4e6e3f0e555da. 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/QZTAU2537273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb43de89659d648d93547126b7ebdd32fdaea41be63442e8d2b5afb096253bde. 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/QZTAU2537274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ca0e2dff9a3f721b9568af2d2e6ff300c5fbf580965db2389abb7006020398. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZTAU2537275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc141906c93a0355c85d946bd20b070bd3d87461ea8ae0b90756cd7c83e0d2156. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZTAU2537276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b2e65de6f489a947677ccf340cd19e52be105d5aacb72c64ca1a5770498f81. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZTAU2537277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9000607310edf950bf108c851c0ca66e8937338f2e22f5a10d4b78de4877aa5. 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/QZTAU2537279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d45becfb2fa2f5f7f64da6d97e1abb6531a6462e9901259316c445be4c3e6a2. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZTAU2537280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6800637312c249ffc31f4d003761ab3d0126d2f0cfd8f4612e1234fc2cd4b56. 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/QZTAU2537281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e9b7247c3cf15d4fa3ef8c8f03dc88b3532e40cea8cda80a27c74e1042c34d. 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/QZTAU2537282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e0a627a99fd068b45780e8958349915491f302b5277bc6e6eacf7a726d9e2fd. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZTAU2537283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5209f65dd98fa7fdedab422525f7ce32e0886893b3c23999634a79bb5dd3325. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTAU2537284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18a778f63f94b20c5628b3c3798f2d66bfedf87b166c6e84f14cbc7e3f9447c. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QT3F32520112.