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 0xe0165e6e79256ea1f22608764b9e58b639aeb52af0abc393010909ae9cf04e63. 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/cf8ea34b-b409-4051-82b5-d3c68063bb59.json and https://artists.proofprofile.net/proofs/artist/cf8ea34b-b409-4051-82b5-d3c68063bb59.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 0x7c3150f3200787bf7bee6210955eda651bd85f53405de01c077bbc415fb0f483. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZHN32115125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf798e8ead73cc9af92cfc96522b3c08c993e9b238220e8b03f5cb4cd82310fd5. 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/QZHN32115127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dae6987f23bb01a56e25d2360b1d2a695605e03b80035a8891982077e543f69. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHN32115128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7028b88b8df7fa98f24ab581d0b28e42c61b370c08014991b718ce1390b5e0. 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/QZHN32115130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa914a006748a145a6d2ce100da93f7a218a14a75d1c31f2ed5a0278d637018f0. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZHN32115131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3150f3200787bf7bee6210955eda651bd85f53405de01c077bbc415fb0f483. 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/QZHN32115125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7a8024a0232abefe1a45e5613ec7f4f738f623d074726b9c43e3f140825414. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZHN32115126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf798e8ead73cc9af92cfc96522b3c08c993e9b238220e8b03f5cb4cd82310fd5. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZHN32115127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dae6987f23bb01a56e25d2360b1d2a695605e03b80035a8891982077e543f69. 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/QZHN32115128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa914a006748a145a6d2ce100da93f7a218a14a75d1c31f2ed5a0278d637018f0. 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/QZHN32115131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2fcebf56b5e78424392d2a31accb955ee9d3571233db28fa0801343ebe9661a. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZDA42157128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30229cf707a8879a58f4431adfcb37cabd820e7edbccffbb6a81ca17588a999. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZDA52144332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30229cf707a8879a58f4431adfcb37cabd820e7edbccffbb6a81ca17588a999. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZDA52144332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7602836ac2e75204fde21898ce6aa88a5f59596b1059d45d3c7d68fc6169befe. 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/QZDA42156836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea42a2ec1e67e1a140c17f3670dae4cd7fa75bafe68f2d6b4e20d7fd08c44476. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZDA52105369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a410dcbe1653e941c17e5d4e48c2aff42ee0e47b94317a3e611cb096ea3992f. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZDA62215872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5ccfa4ec5e8d49b5dd5d0e93f5c921520a973b1cf91717c6850825539dfd72. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZHN82203353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb5fbdc4ae3e5ba226d0f348aa4d2d92e63e0a89cfa312b0dba3effc619859e. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZFYY2362178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb5fbdc4ae3e5ba226d0f348aa4d2d92e63e0a89cfa312b0dba3effc619859e. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZFYY2362178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabdcfc64cd24087876ca93c3fa6b9c1dd50bafd81c64f40d4d012b852e0528c3. 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/QZWFJ2434211.