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 0xe3bfacb858f3eb9c4c85fbdd4e475ce91755b5f1d516cd1331d688c834f90f2b. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8345aeb9-ddf8-4308-974f-c07e017fe6b7.json and https://artists.proofprofile.net/proofs/artist/8345aeb9-ddf8-4308-974f-c07e017fe6b7.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 0x9f6b2539e6e84416393f40f5ac61a6a3329b1286ca8a35b5ab40f49737f59ea0. 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/BX4X42400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9feadf26b89608330e0eba0d13303d0ba17d7253fda0bfcb88f9bad598fcdf5e. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/BX4X42500034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac4fe52c8a1887deec50bf44cb881e7403339bd84b1136b76deb0f930eaea95. 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/BX4X42500022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a801e7dc1793d520d96f5f3cdf32de35c0bc054b500ca43803fa247cb5550b. 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/BX4X42500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11732334d5e1e643107da2305fdc04533b9c89cdc1918443f201054daac0a6c2. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/BX4X42500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82737361aa6e7e3db1f517ae3a7639c091608be213aef2c6b6b401661f456d62. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/BX4X42500031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7bac0b7c06f11531ad5fdac551e7769313f41827610fb964f1a1006657e3f6. 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/BX4X42500032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170d29820fa4299a7a27219f8261d58864b7e2dab8425bb1e7fb44b64aabf8d5. 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/BX4X42500030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79dc123a7597cf3450c0524c348c8d382c1d5e532cfe9ac30fae3db36d037502. 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/BX4X42500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902ca7b5a97e4919806853421110a771f5b3f3ef4caf44496190408e2a5ad3fc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BX4X42500029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0c92d73d2c265de33bf9bd3404deb31b0613c2a2cb4a5fe917dc850d3b6443. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/BX4X42500021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c2b95e0c1556f43d3cc4d7b92614acbf3e03d43392192e293d70a39ddf5102. 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/BX4X42500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac48ee3221b3a4a6029818b3a1858979876c8b125e87eae87568123d2f23deb. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/BX4X42500027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95bd32ec4730f808294a4aef82f234f0976fbed9cfd3c085ad16d0009264c9a. 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/BX4X42500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c11ca94d565e400194bb92f225e2f8f5b12804702114d1e5e86ce1e37ac85c. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/BX4X42500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e71fe57e30c12446ea2e247a0a315132344cce779ae7cd64b089c0bb513e54f. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/BX4X42500035.