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 0x1555a1ca23abf0eb77f485cd7d88a369cf2c9aab7aeb16c5283198e50cea4a1f. 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/08889b7e-873a-4d4b-b013-8cbaf46b0a15.json and https://artists.proofprofile.net/proofs/artist/08889b7e-873a-4d4b-b013-8cbaf46b0a15.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 0xadccbef6e5db43f3049d7aca40960bad32bd7ad7df35983e47d008a95fb7b699. 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/QZP7F2431483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d88a20e0d29a13ca23976d9bd3f47b0c4988055deccc1e06983194f48ef50b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZP7F2431484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b7128797b2caa17a2062752a261589d21b171a5d0dee484dca00acdf748f89. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZP7F2431485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a549576ab0114046363fae0df322bbc584995d63fc647d01f0f6b4a1de980c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZP7F2431487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9926f06df9963f649a729feb140acc3458889aed3954abdc25102438b1a69441. 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/SE5W32406050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9637e90c4d83bf09bea32e07839cb809c9b09463f338e8c67f9d2180b977d7. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/SE5W32306873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f8d400f65fa12ee3ad6723069ea5fa2a28354c6f8bee9c10eaa890ff7b8e89. 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/SE5W32306874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c4948e6a18a4a674591d33dc03e169ace71e48dcb91ebb12f7413a3fc1627a. 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/SE5W32306876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181a1d874e170b335462f3942b99f0ccf7c15591e35eebff2287c5971f404620. 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/SE5W32306875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448121b57f111a1163990aac01b0d129c8e69fc324860e14344214b062398b9b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SE5W32294817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0e938f914f9f21d7e587604624cb4c0ddf6726cbcd8e52b5f4b73b1eb34fa8. 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/SE5W32294818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e0d2f1e82483bc988d4a74188dc9db0eb1ab628cd930ded456ab16a4c5703a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE5W32294819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31e04976f1238e7991943596b984597320cbe90df1bdd0fb8bfc5d189ea8f25. 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/SE5W32294820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6073f3f8ba416aeeb6aa257ee0db498feebdf334da5a7f0156cdb44c339a36c5. 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/SE5W32294821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x135a6c634383e719c52deb8c1cb6744d005bd03810bf5cf41fda08bcf0d49204. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/SE5W32203719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400aa8f00d8380ff798ddc637ad23a5092d45d641678be72ff588803d44e9e22. 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/SE5W32203006.