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 0x8326c819a2f0cbbafb0901d8791422a7676726d42ed0556362bdf805ccbd43a9. 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/318d5c16-92cc-442a-aaef-e25741001bcd.json and https://artists.proofprofile.net/proofs/artist/318d5c16-92cc-442a-aaef-e25741001bcd.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 0x3c08b30de4c74ef4f8b8d89df8fc4a00bcb613a52016f571c0e55a0b8a6426a8. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/JP92N2409717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7ae3eee7507015372a261c0f1d880b66966c9ebca07fc014199e37f47c5658. 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/QZBRF1889897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8418084dcc65ef2af5efca4f2b2e5cdd38f92201f6a9eb8dfcb5d6981bc946b4. 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/QZBRF1889898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18edf7061ee9617403235833e372be0c913768a8801d3bb8441f8e983a25abe9. 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/QZBRF1889899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3fc5e46b6e68ee861c858d8e932ae2a4bcf409e9de9471f3c56c5e5598dd6d. 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/QZBRF1889900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e392851d8e3a454d5038ab32d7e9326102c4e410e2b6d6ea066a3ba3848d7c. 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/QZBRF1889901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x470d21c5bfd58332905c37ecdf485db4cf29ee0d97d2b3df34b79f2b48db3de5. 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/QZBRF1889902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7809a94b96b9ec744f1939407fecf7a4c9b80b33ab35aafe1e9c4b08af329918. 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/QZBRF1889904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6047bf67a2c28be818958dc543f5d19f2d25804fce10c451e27e54dbe99ddc03. 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/QZBRF1889905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992b6f4640a606fecd40b7b4d81ea8637ff2d30442923a5a363abd49695aceee. 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/QZBRF1889906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb036ba146638779c1efd419282b70fe610a422c360a0376cad5705463c3db9. 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/QZBRF1889907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f40594376990ea176bb6dc046aaa09c6e951b95d0499b0c8e03b0897fb10ca. 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/QZBRF1889908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228e3970204a28c22cddd0af502a929b4850a8492a6a9d2f0721a810a4f2fb50. 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/QZHN71998168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fc3f28f115b803a59096f48dcd19a6e74bc4336ad2688396275aa5c685525b. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM2PV1812756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a5d7933a01dd50d90f7fb7ae10db20945331196d5e89a3734f5887590daac9. 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/QM4DW1853917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbbe5792e19ba10dde16251fc86ec14291906e13733f726201723d23a3ef085. 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/TCADL1865477.