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 0x1bbbd0ebb86f14b04ffbd02f4b787c506aeb91da3cc8723406861cca2fd7d55f. 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/a92d96b4-397d-4601-bf62-1ae51cc02d9c.json and https://artists.proofprofile.net/proofs/artist/a92d96b4-397d-4601-bf62-1ae51cc02d9c.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 0x360530d713abd945dbbf197d55ac50b69b66761fef586af0abc5924851202567. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/USCGJ2115675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc94e0b3b253e90efcef80349ad49f157aea1ad5cefcff92e61b611107dbf6d. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:56:56Z), 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/USCGJ2115671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaf4971ce17ca1346439107c496d075dada1596bc363800118a0266c7946ef6d. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/USCGJ2115672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd349bb614cb6da448f780310a488b4ed34ed1e367ecbd3a7c9c73268a2ffbab1. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZNJW2145084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657ff4c0bdc4ccb3bf74c74c34e815aa8b3ddc4c34016482bec93904cc77d3fb. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:18:50Z), 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/USCGH2232062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fd719ebff047e0fe9e50018a51ed2a80df5dfddf6583534ec4b1f6f5f0d0a7. 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/QZCLS2212937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f5757c2146703ea60451cb4d8c41fcb87afc24277f302da46803e62c6ae3d4. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZW9M2261414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70183f53c4318824712993af5439ff4dd44d97faa636bb831722226c8408ae1b. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZFYY2366711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51c9ff6197b6f7f85b41ccd4c44d58d0a374dbae4d1558f9ddce25f1fbf1695. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZFYY2373061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c37cfe28c54065395403542d368da8da632545540a1ea7f166397c7d03da04. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:24:29Z), 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/QZHNB2300358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6701886e504f42293cf435ae2beea535b23cf62c16a48f40a072062ad7bc296b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:17:49Z), 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/QZTB32360124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59050397023fd2cabe8d540b56d18758d691666965e0573efecae25e3820d5bc. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZTB62386133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8babf480ef88b1b0fa6aa8fc8d793cc2f84bc83f8f0a76991e9c7e5f38b1025d. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZWFP2361607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d948a18c0190c2d1959bf255e1007c651d78d47da99b0c6a6f3eecf340eaec. 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/QZZ792535431.