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 0x71e36efa78e2bee18652d508d2f8d240cc82e9759f6fd641910f8285528d67d9. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7a54881-9111-4f12-af12-8034d10e3cef.json and https://artists.proofprofile.net/proofs/artist/f7a54881-9111-4f12-af12-8034d10e3cef.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 0x8a67400d6a44477ea06f278dc4fc3856dc12f463c74f0fa0c8e4e9b657d2c7ad. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZNWQ2510512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6d4caaa6f3629361ccbec2cd52755adb96bfce8c20a8140d5c1c89d2438dec. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/QZNWS2541372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4669096c39e5936b0b4b67224e578f4baa14aa662d64160e40682107a33b09e. 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/QZNWS2542426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6019e93b0af0a9e143b7f7af8e16385b9f5963f4f9d0e8d4e6a304ec77b01203. 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/QZNWS2542427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec77a2da60b2e0510f24191abab5bc367fbb635c85b2b7487f6e681a0d5dbcc9. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZNWS2542428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3968e9e4cd6b1383da7b8f7cca0aa323c2b7d1bd1edf8e9f6e1017bf7bc9417e. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZNWS2562347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2fe71c693d7419414dba1ff74669a35427a91cb5b2059e59bb89cee2f9056f. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWT2524798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57dfede86f98078bfb8a6c423e1093deb30e4df64cb5ba6aa4563127d2e5ca3a. 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/QZWFN2578206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75754566bb0a45ed71a664239c419c8c3be4f0c0562d017b3dd4a8c07da105af. 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/QZWFN2578209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a91f9c6fad558646cfd8782d8397d69d91af68f558aecee3f54d523f6e69d5. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZWFN2578210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f56acb3abd43530e31d0ef42041b1751308181d2bd01c2f8c271438d76fa9d0. 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/QZWFN2578211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d7dec8d9c6ccd7f4a4d550b04f6bb2a24f63657c71bca0b6825c2723a2b2c7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFN2578212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2172e0015d37d4aa8c7c11f44d4413272242e63fd0d7b357e5910642f83048fa. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFN2578213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c7f5bb309079c4d45edf22ba68adb280ec32820c6adb864e8cd0844a777e43. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZWFN2578214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c263fbf19359fdd81e5bafd53b4d4e4fcb34cef344cd62ec1d0e2a4718d026. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZWFN2578215.