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 0x52d72b1be75abb06fb12c844e03e591e2da9675f09a4f00a83b1fd715a7a4be8. Chain 2 (Bitcoin): anchored in block 953819 (2026-06-15T18:31:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff8bbd15-5e9d-4552-9236-9ca578e51d0f.json and https://artists.proofprofile.net/proofs/artist/ff8bbd15-5e9d-4552-9236-9ca578e51d0f.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 0x7aebed91c2b9691e0d5bc3fb53769eb90dca88dd47d4cce93333ed5e32bb876e. 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/FRZ180200035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4580a1ad893cf3d4338e2515c3e592d5ee52fed5f8a65d0d95f660974ac2247. 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/FRZ180200036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c5d5ad498ca57f5cc4e422948d91558be5dc88d4e2d98cd45bd498f5221d98. 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/FRZ180200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf07d2c22a417016b654296b387d02e2bc7aae1acae3b092617373f1c2d6ba8. 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/FRZ180200038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b9a4f1d898a69a334553ec7ca2b505e7312374996a37d6794f3d2ec8206b47. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FRZ180200039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1407e28419936715c022f0439dcbf56c306f3d181307183082ad7b85b2917f7c. 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/FRZ180200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b23225044007ab691c61fe42ac31d576cd191a6edfe3d5abfc46804f245d89d. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/FRZ180200041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca142cf36185b8bf13106444ad2b572249b1628aac26bd8c7672aacbe7fd3f6. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/FRZ180200042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc82621bfaa33d024450a1e3ca9b5de41d1258862d206321d88f9ed9b583b488. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/FRZ180200043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180dd32c6979d3de68f39d7aafcc154964ff4635e994638e89a4e72a41d6a53c. 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/FRZ180200044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef30878d7e5183567f987038f346117b410f19d00c9f670d180148fd8a594cb. 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/FRZ180200045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16afc547b39e72cabe4c0f4f7ba2bbfff36d716fe4a3df84b83369655dbe7ba. 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/FRZ180100198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2aeac066800b6660e97565526cf12b7155516558c87d4c737df1246e1916f8. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FRZ180100199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0413b30925396ea81c39484588cf84c9dc79dd37ee6518fba5ebea858db2bf41. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FRZ180100200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ef46d1d3632812df09777a9d90ac021f3861f79196b9cb1636963b18dd5f4d. 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/FRZ180100201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe015fd2649e8a254feab899fc9aa618568c897e63bb2d39f42b0a89c16f76db. 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/FRZ180100202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34cff1ee649d7a346f67c1772b10d01417cfad55a7e2f4ec4e250892bc3de8cf. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/FRZ180100203.