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 0x37f451901b86c5c75f12c4f1c914ffc10f3882678da6c612ce31fdaabf496b51. 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/e80283a7-f6d2-4f76-af38-9d7779fc03fd.json and https://artists.proofprofile.net/proofs/artist/e80283a7-f6d2-4f76-af38-9d7779fc03fd.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 0xe26bd9c16aa553f8fe8526c4f4c0de822bc7511d0c1d9239e03fb64c444976b4. 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/QZHNA1969701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb969e487dcfe8a6fda3dd4371ad17c7b98aed93e647c9f786c743458560efb6. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZDA72298687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8806862a6b840b2465d551623669b47e74d18e4bfca56c15685978f512258c. 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/QZHN72232869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb221e42dc539e0d0c3b5423c9ad5781e8f15064a99f459e38dc5e350ea83441c. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZHN72236929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d53fe9d2434a9bed53247471577e2a5bcdac778738497aea68825f8408f162f. 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/QZK6K2235904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1dce327555d55eb1b5cf79b5a876710378a192d0b6094c7b5782ee00fc3326. 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/QZNWQ2217310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a4075f018b9346577d49b970f08de10c1e6860b00377db7950e0b9dd3a98f4. 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/QZFYZ2301538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa438da5a4b1b7033fde14d0e2c08c1a5c55a83a96571b207bb77cf3e9d2a6b4d. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/QZNWW2375657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46aa9aadf7f766c48762c1b9de75f9f6a341288210fd81ef1da62074f4b5ed46. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T10:52:48Z), 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/QZTAS2307057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12dccc7788e03a97b0bdda08c5e2c6d8fc43a73fd69335db4da6e38efacd802. 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/QZHN92453864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25efe0916911cb4d44f1236314b5868dcfcd709c3f10e5be589bcab6587c4a94. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T12:56:27Z), 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/QZK6M2483007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7809a033f722a21acedb9a4d6ab55c138493d8fca0885afb8625a7d8422435. 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/QZK6H2446295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7d580afe499d80efa7d58f44f74c3c17abe55de0576076b50cc99cbb85b2bf. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZNWU2420705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefd22a343d18072ecc876c579dbb4e4fbcdd31d6fc85ca789fbfce7db3a6d6d. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZNWU2420715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06921355787c13a1356066d43be440dbd18afd7120be2b3c41c2b1d1d317acae. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZTB72495729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943f6554487fe61925fa0390e3b5dbfed24747da315e98ce70b8bd598d981864. 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/QZDA62582005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b9da36495867f1b81ca973300a9451e8eefe2b2ed5eaae873f8131172fec8f. 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/QZHN42503857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912b015a159d19b953c651e3f74d1f7197eee7fe31931c1922e11836b481dd27. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T19:05:10Z), 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/FR59R2524826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c002b4fd97ee73bb0ff3ca85f9d23cd9119547393bdbef8b56edee3558eab36. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZK6J2525516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7f840ee04a33b64d5bebafd21ede06c5a2430e583f2f50adec645b20c69f3d. 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/QZMEN2548642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1adce6b336edac7cae50248fccb8021c73b62e7a15baa507566c054f21adb079. 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/QZMEN2548643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e86b301f988dbd9bbd834324b6fa854aa2e3fedbe2310b1c3eb3700be675e1. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/UKZGC2503597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd7ea3769b18659168d6f2a8ba3873a966bbd134b4986dbdd7f08a4408f01af. 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/QZTAY2509373.