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 0xfd3077bb76cfe20dbbcd691b270552ebdc13f833a4d422dc973e1a3757c9019c. 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/b271564b-62f8-4f59-815f-e5e9f234b69a.json and https://artists.proofprofile.net/proofs/artist/b271564b-62f8-4f59-815f-e5e9f234b69a.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 0x787a4127ef37abc145acc81b5c10b3e6ec800a0040293bec9ee1e113c7e689b5. 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/QZZ7P2441231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad08c53641c6e447974d7db0326c9bf78a465a7c92f4494c8c98ed65279be821. 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/QZZ7P2441232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x731240964d2bd72770716043d2ecc3c7c35e71b9e0e77ae5992f754879ab592d. 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/QZZ7P2441233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8c8defbe13dd639214db414c8a8a78ce3b76db9f92c816174885b0d8823a16. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QZZ7P2441234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa04c04b396d026e3a77853459e3abedec8c57fc3e1afa73c8ca711660dbd024. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZZ7P2441235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c769aca452830c5b51e75eeb7d094f7857e02dfb713e0f15deda2e68e0be4a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZZ7P2441236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe989dc8b69f02a3df8ac969e2099a744e61d66a1c8cb008ef7f242bf1f9735e5. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/QZZ7P2441237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8058b0a6df2c1ab62748f00274d4fb580f7d456b7f55c70ea07a0513ca818f84. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZZ7P2441238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54c86c03d5b6ef362b57c7f81384384edbdb7bdd586f7adfa8ce6f79e2dc421. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZZ7P2441239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f095d0afbee03260f045a0ac766a58a4f1498cbd006ea00b6525acdd52016e. 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/QZZ7P2441240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24f1a4b142e1ccb031cb590b5ed0bd4ab5eac5c92fcd6bd4a7b1ba34bf807bf. 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/QZZ7P2441241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146b09e16fc827d270208e6cc97cb015764f08dc4d672d9948527b862b73425c. 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/QZZ7P2441242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2096b59693ee87f8cde0a89452820418ff3bc94018c2ab5e17f1245794759e67. 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/QZZ7P2441243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b86b1c17e6dbfa6710726e38124102ea03d008c1b85048fe2bca4ec4f108016. 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/QZZ7P2441244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f4a20a03115a19dd8c466a02c4190f23bc606b76e64d871cf4257af4b8c7db. 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/QZZ7P2441245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dac19384d64e9f6cf665ccd9d48e43bc0b49fe7a18fe371e146db4c984bd205. 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/QZK6J2554343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37489d7469348e29203d0a047632b7c9cdd457d03e44be339eb415f7115bd0eb. 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/QZK6J2554344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50e16c776e5fc108fd302c5add3f650803bbb5dfb6d68b044352c646b8b2e28. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZNJV2589055.