Blackbird, blackbirds, black bird or black birds may refer to: Birds Two groups of birds in the parvorder Passerida: New World blackbirds, family Icteridae Old World blackbirds, any of several spec
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 0xfe0c0b6de96a0cfcf466d649c966e92c7059e7c538d1c7871967e597701ba10a. 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/b5981f90-b2df-4c0e-940d-dfdcd75ef4f1.json and https://artists.proofprofile.net/proofs/artist/b5981f90-b2df-4c0e-940d-dfdcd75ef4f1.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 0x4f31d563225e99786a3c314d3491d0282138bb1e5e01ddc87752d3d872a0a5a5. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QMPKX1813125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0ea14efc8eaa5ff052f689b3854ab6edd07d57693e25a084e79720d8a79fd8. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/QZBRF1842471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8330e1facb0581235234f8b560e4af47d3930ca6cd28f922372c6ccd12c8a41a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZBRF1842473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f55aced5725f4ad19bcce142100e524af4714ce602d0774606c28b223cea2f. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZBRF1842479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d7ed3f67206860418117fe71db1f168f428b6d012f96da581ab2727d81876a. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZDA51810561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb172668d2e9a677b55c7f50fefb8bc3d1ae31ab8b501b405d2c4ce7caa13aad5. 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/QZDA51910804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0c720e479e87c77f8cbb9b8998d7157991d9417afde08c4786baff0ac20ddd. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZES51939500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e4ab2b36ddba876f31422b4d3fa29e3eba45ef7b7def389efca4dcc20600c5. 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/QZES51939499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b771e32880787731840b929aeb0d51348e77b61a499fde69d89a53c0525615. 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/QZES81950600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc303bbda59a0fb81cb8f24f7f6765d84ed691e183f9e6ab9cdeb91b267761510. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHNC1987356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082357053874e22f22352e7578cb84cfc54e900fdad81667a82ada2c3542a94d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USCGH2300562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966b300865f553f52a371d7f71fa7e45ffec3b3afa3ac32b76f716c9be707184. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/USCGH2518987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ecf0981911850611cc80cd5bfd17bdbe3451d8f10b99638918567bd4b52dc91. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USCGJ2572680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5b491536791555f279441b6915a93301bedcb5002a3a4ec5af6dabcfff7366. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USL4Q2542364.