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 0xe253d2c558cc88285d29f9737354f4a4a8d23bf77c1ef4df253d0b72849d7f5f. 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/c64c839a-a316-46b7-9998-d9b0f7a04172.json and https://artists.proofprofile.net/proofs/artist/c64c839a-a316-46b7-9998-d9b0f7a04172.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 0x7ae417628c529835afc29694c63529e449cb355f7f976241910f65b8900d4998. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/US7VG1542213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab105fe9250e62855afeeb3e8b5141aadd98c9203861e9dae8fbfe4cc06b511e. 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/US7VG1768951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751ccac605ed75386030ded5c63f0b9ed7e9f9e6470574392b52b2d59e3345d4. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ5AB1717277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e13ff4aeade400bb5fe9f1e6736a0b7e47ce2c88a65264912a84ea54b9fbda7. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZ5AB2021385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e13ff4aeade400bb5fe9f1e6736a0b7e47ce2c88a65264912a84ea54b9fbda7. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZ5AB2021385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca7e22dd7ae135061f097ac7b6758a8a2e21dbdd00dda5b42681f3ab685f530. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/BXNT62205094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a53dacafa5149bf74c514ce3b325d8326ef46fa29e68b4ebb20280a947b7e4. 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/BXNT62205057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad589809e688e908c1d21ad4c04424d4a5dd1a735c8a0cd53f794d11fe77bbe9. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/BXNT62205053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d9495e959bbb13ad3b080a0db7d0c38530c017bccffd3c04d5d6f845053cf1. 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/BXNT62205054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eac43c0c52488aacc2bc2c0b06097b457b8f181b3a3b9ba340304309d60d090. 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/BXNT62205055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6045a074992b45b9e06c07f341e49cb05f68084b96abc96db1b75fe843c0dcfa. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZZ8B2456405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997d4fcf914f6d239a369b9b4ef13f0dd26e884c8e0f4a6abd1fa6aeaf24dced. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZGLS2530275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9aede82653bc58cf2400d5bee2ba49268d578f2478bb672cc6e70205faf6f5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BXNT62205051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f665ecee237e8c8422f54752cf6c992c57bfdbdd4a86f6a881eac34c8979a82. 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/BXNT62205018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04cdb51f8a529cb505d5ecd83ca0a65f33f505b283ae91e3d388569986250b0c. 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/QZHZ32080598.