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 0x3695885bb8b3bf442ad0c34559c4958ae5e471a2372b1dfbdf42240538abb50e. 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/ca1e8c6e-a8e0-4406-a3a7-3948b2c4f272.json and https://artists.proofprofile.net/proofs/artist/ca1e8c6e-a8e0-4406-a3a7-3948b2c4f272.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 0x3e36d2221f1d08013c426303636c3a127e56e4141b28b1d9094bd055eb0ebbbf. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/DEYW82204746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfe82e5f1a4fcafd87c43a99608f0293a5bf4ae0971e888e15df4ba93695717. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/DEYW82206095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808698da135af3909001bdc7614ff850f9bf876c9af8b1ce1db9428277e38815. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DEYW82207584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70dc55445cef77a19dbb169d806a365f0e347042d2754201703451d79a5a450. 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/QZFZ62370993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e735378cd6ba85455b69f653a11dee3352c788b6580bb8c016475dbcbf69c82. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DEZC62338864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcbeff33980d1a28f1e76b79b29bde437c53f87ddb1ffc8696d3d9da85817894. 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/CH7812346995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92bef1793ef1b7036c8100ffa07a30bb62256f6a2ceb9264197e712c14814d2c. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/DEZC62338866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0c7d9da84e74ed89da545e17376b34d57656994187c16c4aac42b32ef6a3fb. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USZXT2353125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc3d57a4fc7fc82f1823ca36a0b81db7febe4f3d90388743e315bdc8f3053d83. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/DEE862400519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e89e75e49baaf935d446b1ef425f741492e3af2ee567787693634158769c33e. 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/DEE862302012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf223a91898d636531305026fdf3109d5bb923bb4149eaad91111090983aaae75. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/DEE862400888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc478c1df574e317830b2692cf334a41e6e8bee2aa88136a6ed81fd11c234a26b. 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/DEE862400914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d7cee439e631736fc8953ad45bc2f7d9cd224dcd2c355d21b93aca4da20be2. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/DEE862400913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008a078436092a26dc7768766f514c8b1931bc851899a446793a000fffe5cfcd. 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/DEE862400910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x574c10c56f4641eef1daba0c3dd7dce98ac83d46f326c3a6a2f0957e08028a73. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/DEE862400912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc3d57a4fc7fc82f1823ca36a0b81db7febe4f3d90388743e315bdc8f3053d83. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/DEE862400519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadce3aa4b313830e43b8ed164c33586df242f6346ccb6ad998e99bfe5cc90dc6. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/DEE862400915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e71c67534262c3fbc3633c6bae3e5ec63af20303090ed16202e5b09749ed4ca. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/DEE862401795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f14c097f79e79adca09769dd0f2acfaa38977d077fa4ca5c5f6eaa139a1e91. 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/DEE862401999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e71c67534262c3fbc3633c6bae3e5ec63af20303090ed16202e5b09749ed4ca. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/DEE862401795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d782008cca6bf1204837d1a25d6c568a021e9782d6e2e5e5197ca332df7fa8. 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/CH7812402733.