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 0x3b86aa97ab505607a137ba014062f3bf0291b846ddc85e43c9ebcf548adee400. 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/820492cf-efcd-4d26-a21d-ca964c021d54.json and https://artists.proofprofile.net/proofs/artist/820492cf-efcd-4d26-a21d-ca964c021d54.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 0xd2db5df2778bb3c8b6d80ca1b6afef9f8c4476552516a3dde417c25768cbf7b1. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/KRA381701211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4dbacdccf96adfc26ddab283fa6e1e97892375bd5fbd0004462c0e2fb05c5c4. 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/KRA391800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4814fa274b74c85fd5dc7dff667548d4bf703a5824d54ed76a9f87efabef3f. 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/KRA391800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf091eb8da47155d28dc262bc443f850208c270513abb39ec663adb68163d987c. 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/KRA391800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4dbacdccf96adfc26ddab283fa6e1e97892375bd5fbd0004462c0e2fb05c5c4. 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/KRA391800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183a6f0b4dd09947016b1231516683fcb238f508ae0b5f1fefc5510ee87628f0. 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/KRA391800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda63ce38209eb01135ec7a9c3d78d6b676d4655b8082fa7eb71b13658b3b583e. 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/KRA391800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5963e14d359047e4d4f64bb656055384b82599ad10ac406fbe67914ee1637e. 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/KRMIM2505282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbb88a6faad9ffd4e30a6ced3c424368134b031ddf170f4d6352cdf9c2e38ca. 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/KRMIM2513123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee762a8a2991e6746d2a39f381c7b3e886f164ddf070245d72fb01aeeefc244d. 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/KRA391800033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda66f53351fbd9bd5bef8f40eca996e4ab81de62adaaca6935320334619b087. 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/KRA391800037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a605d2b2bacb1d56588f5e257c47fe36976d2b053f307903576f1717076bfb0. 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/KRB461800804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15df2d59c1d86985ca7245876775c3e696a5543919d0151d3db71ae9dca3d6d. 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/KRA391500046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10841d6450b4657f04e6f324514e9ee987712e9cd91db8b503621da4d16b81a4. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/KRA491501034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94fe5631bcb6d885c4673a3e68812c644485255684fc34d3ab6c15bad9703c51. 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/KRA491500960.