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 0x29e45f06bd12f61d17a27ed0db811dd1ec175b7bc46027c01356137bddd20611. 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/0b360910-87e1-45dc-8ef5-20bdcf58bdcc.json and https://artists.proofprofile.net/proofs/artist/0b360910-87e1-45dc-8ef5-20bdcf58bdcc.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 0xe8e2367d2f56cae5f1b06716a2a654d31a7fc31d8a59a62df40be21ec2deb249. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/FR4U10500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0481ff3fe249ed6232bd8b8d950d22a87dbcd216a1931b75e5ca40b38e0637. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/FR4U10500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb287d236029a366c5da73cdb15ed2349236c01b55f2fdc284e470933b96271. 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/FR4U10600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29dcf52cb5bf7c978254cf7e70b8a81c2847931fdaabe5db05b2fd773d2e2953. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/FR4U10600021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd262f912d258d6657275d4439462a82374ca8d2ac5601839300b903a68534fa9. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/FR4U10800034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e045643822ae47cc4ab79273a41befac28594873531f82b144b7a46f22032f. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/FR4U10800038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69c25e264d8bae3d37c1ea131839e65fc5e13d5e0aaa47e85b0e038ff97b5b1. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/FR4U10800039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40aa1a5b7cb1ebc795736dc2be0b29c0cd893a66a6b478da10f3b794f92f1bbc. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/FR4U11000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983c1e78a0e3dd6c0267abe08ce06bb0286db8e4ac2804d16a5e0de62103edf8. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/FR4U11000063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9799a37046b81318e8f62f259df3fd99486e441ad7925011c8108509afdae3b4. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/FR4U11200090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415fd717fccb0befadef0742e1115f5cb98cc7e1011ee52378b34e5158c1b45e. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/FR4U11400097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff5c9feea570cdf6ee2e5c6c9f465d81e7f4bf323b5b3fdf41f1e4fe4b18f83. 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/FR4U11400100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439ecb37c948052c1edc59ced1a2425b757e89d11fd5c98d18a10655d17c63d9. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FR4U11400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe338992583aeb085c78a3b7c875ff26414f9e044a72bab1bdcb6d66f0bb6e120. 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/FR4U11501390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd700fc15f1499e56166e4e0947c6732775020e382508dd28e9ee6de11c30be84. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR4U11801460.