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 0xc7df8ade00380d438278762050e2eeece41415bec012706646736e4fb3cb5412. 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/c5bc6b38-a64f-4e3a-b966-6239b1052ba0.json and https://artists.proofprofile.net/proofs/artist/c5bc6b38-a64f-4e3a-b966-6239b1052ba0.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 0x94195a2149df087f264378ce8d3320a2bf576d9e8c6e2023b1688a2d70039293. 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/QM6P41992310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0200bd3cbe5a54f4da71f776ef1747fc15bd02a1abb953a8513f25943620fcc1. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QM6P41992311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f884dbdfcb9352b4eb2a2e2ec17242f9e36c478e9f72bd288dc7bc1e97f8540. 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/QM6P41992312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6130b1bd83d1dd493037bf6fc5e40e59d22d55ef00f6521b316b9866c880bd88. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/QM6P41992313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8d4f37d84ccdd2f0c2f3e2778f51d09ab6b95db50e00df9440933b57038179. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QM6P41992314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e45c40896c47cb6673560b7ac896edac0a1ed78c9ecbc65259b84b97ed885c. 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/QM6P41992316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb888831fe2fa7c2a6e2cfefe1514887ece33b962593d2c10f327646eb1ed4af. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QM6P41992317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d9818edbc43e67dc8353a19081148d27b53b3a68d8c11d9a26a198ebc3e5d8. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QM6P41992319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788c17731220b63aa96ef942dcaa8afaff4fe854a7446e79d7d900ae9e6e21e6. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QM6P41992322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6def9337e83c891331addc1a61da3aaf535650030a6761b134138d12363745d8. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QM6P41775208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230faa9c4ca3e52c43f14369c9d5887f78c41db6c5b0c338138747d44408a5ff. 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/QM6P41775211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe7470e86273d5826282a50ae182d598d2fa1ac072b8c5feb67f35ed9ad4f1e. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QM6N22221638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1702c833f4300d988ef9420fefcdd6620add51220c9b1fc62f0cc234d33c2d3. 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/QM6N22221643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe4c2f0f3886bf1ee73e091912d6f5a0eb9ad1993b5bd934517d66282f375b8. 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/QM6N22221653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533ed3e755b186acff09783e52eb4df7d26014fc9b1e837367ba59527f34fa3b. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/PTIDS2400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d25c617fca7512e828ec2eaff04950e77b0c30184724d34dad65f06e53b083d. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/PTIDS2400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c77c504fac95f51dc34f1e65eda70e140f0a0d568e9e710bd4a1427a7118648. 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/US6QR2400091.