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 0x487853efa7d0003c3bb35d4f40de0a354b89285de8ad441452067d6cb6aad990. 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/85f70962-dd60-4dbb-ae05-77a56c974ae1.json and https://artists.proofprofile.net/proofs/artist/85f70962-dd60-4dbb-ae05-77a56c974ae1.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 0x55128c508d30574ff6c83f6be34953f8bcf83483ea9623a0378eebcf0ae6a89d. 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/HKG732272566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d2c87300e5b0e009b62d48dad8554f5898887b2e24cad502c3d07303ec040d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CNZ852305635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13eb1ce7092f5a9e758e00d5a7796abdb5eb7b87dc01efa978afcb457ccb8ec4. 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/CNZ852204327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f50a8e39a077d660e48a954d101a54b173f5fbf8ce7ad69e23bd1a33f1e6bcd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKG732272567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d916b339e8e3f4b6a7bee2fe4c7d058814d15dc24d2da707e84653d74c1ead. 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/CNZ852203918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f71eca328938f7628c1c67242b44a9261e1b810bfd3c6ec7c6b592519a6f651. 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/HKG732467341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0655abe4077039718492bca0f6da3335c15b53e5a0578b2bd8e005b59c136ab7. 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/HKE672400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4d35f38a38b8808d5b09d42cde7506f4d0caa5c2f2fc480a57b1a9d8cd0454. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:44:17Z), 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/HKG732352516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641383f9753ab0a8d9600fb04f3af3040666f313a9f81d36574d573833ecef3c. 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/CNZ852203680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f8fc8d6f52f16a4565e5b5ff171772d6cc62fc5cac95ae1302fd0a760e3a9b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CNZ852204912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c2ff816bef3e64a51f889c87969efea57cdc7e04ada53dc92c294948a6b7be5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CNZ852205275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaccb3abeca19b24f15d9810d7faff431e6d7666047934c9265405c5e44c363a9. 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/CNZ852205436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0388296430f12b2533dec791907c66aa1e1b20ab7955e0ac12f82a18549848. 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/CNZ852203488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f41370e7ec9ee5b392039c732ceb7b10e323bd8130aa58962e45488f8d6f9e. 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/CNZ852202755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc08a4e1acf1412cbeb42ed12a928c0e44dfeaea6ffd97e45a6a44bf0a277b7. 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/CNZ852204744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf01106c4b819f43426535aedb932a0c171c447d798492bc5a0d2200db645e6. 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/TWAE31801882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf01106c4b819f43426535aedb932a0c171c447d798492bc5a0d2200db645e6. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TWAE31801882.