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 0x60da405f630f4c5ec6f5c235b58c65ce6b6629c9f20fc2fb9ce02c91d85540bb. 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/8a8e36d5-030c-4930-9f77-c284c64c5d0c.json and https://artists.proofprofile.net/proofs/artist/8a8e36d5-030c-4930-9f77-c284c64c5d0c.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 0xc2f900b671832498b8ba944f682b3a34fc1da573c89022604338ea0b05b92c12. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/USCGJ1284178.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11fe827456a90443be52e048d2bca02242c23940ebb8dad2eedd41e6b7a8a550. 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/USL4Q2006235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc5c3ad62a931ad4b6d099ccba945d1689dbbc2b2c953b084e7f1c8850a2912. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/USL4Q2006236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19beb074df0e5835602b95e623e35499841313fa66b80bb27f7d52a593a9c96. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USL4Q2006241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5289c7e1c33660d2889e2930f0bd8511e70c49ee51c126f9814b2d5fcd7ba3f3. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USL4Q2006242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4753c9aa9b59638566261365054812ad6599567147bd710e844b9ab2379e9a8a. 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/USL4Q2018305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928d6f4e73eab21568aa3c87011439cbc158c7ed1e2e08c06af4cf0a27606ed4. 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/USL4Q2018309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32aa4a7ef939c722360e70d7aa9ce58b8d96aa6701dc17619965e8342a1b4cf6. 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/USL4Q2018310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda95e7981b74494f5397b61bbb95570e1628e0e6cecf0ed67757f9d228648a69. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/USL4R2025762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19dab88e8573b013d20b531d05e7471ec7cacd4069a6337cc365d0dde6b6cc49. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USL4R2025764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db89f617c3cda2664d0e55b9bd584eabd8412b3196fb7b16626b5521d8d66d5. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/USL4R2025765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46910b8805e43024a90c0953e69fbecaf9318698b9a0fc88c6f7f94cd838c80a. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/USL4R2025767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c9ae951062abd7c7bc8103f5220abe38f4ec80a5cb921a6fe1fa53b26cab63. 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/USL4R2025771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b101d5cfb45c57e262b21a2d68d12121ead6c397ad20fc78a456a9f191226e4. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USL4R2025412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f427b05b10913b86e88920fee4ef184affb3744e52bb4250f691d8fc9ef35aa. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/USL4R2025413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20ef71b3f966bf6e3af7c63e346bdac057a954468b8db8d6e96bb8b57c719d8. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/USL4R2025416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a91cee917b8e94a83682bb3e4c37b75e305e6ac87afcfc78c183e10ea7deff6. 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/USHM22528430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92fa92ce23450a5f8ff9333c519ff101363164c01faa1c5661157fc6a1e961cf. 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/USL4Q2502061.