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 0x12599fcddf65b7c685ae1f39fee42f41f900210e61b48430b5765b50eaa8112a. 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/21dfc53b-845d-4c4b-bd30-c4d5697f5bc7.json and https://artists.proofprofile.net/proofs/artist/21dfc53b-845d-4c4b-bd30-c4d5697f5bc7.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 0x3c5b1553f5126b46e077bc0f022414aaa92e94de8385432e75e13fbf5fd76193. 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/QZWFR2523665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5cbb8626c11134014080eefacd2a3a9cc37ebbc3751443eb790d3f930e5d53. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFK2557403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6c799b8ea383a274c334f5dfc43516bf2f3a338b38bca8577912aaa4ee1e5c. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZWFK2557404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba35e11292da00cf6eddd9c5b3f5d4c087f0fb48ff0b251533a1ed1cec238bc. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZWFK2557405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e3e92a6bfc2f5129420a0b102b031a87b34a7b6d38eee6c352de1505b3b1963. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFK2557406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa453c6d98a9575127a6da28ea9e9a048f2745e28eae06aaf172d489946b161a. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZWFK2557407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d26c5a11bb500de31577a8d4c7126f09dd81c070a7e279169baae58d1bf28b5. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZWFK2557408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557a7c7e50ab8c0f9776988c3be16e5823d0e715e6ed41e9bad6a6690820a0c0. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFK2557409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3e009736bf0830f18cb64b419bd562c53d8d3b63ddee4aa0746e5371830a2f. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZWFL2520089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ced4b0c0d6c075e990e9aabebddd772e10a5006c9f66dd6d97bcf21d72ef98. 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/QZK6P2184767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1159a0719b25f03eeb9046445cdc535ce16b41232e4f1b44780fbc73201e4444. 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/QZK6P2184768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44521b00a7f756397d5cd788f537329f2417a31a6d56e032894b5d5e5122d0b3. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QZK6P2184764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfabb13a75de03771fb2390eb2cf22d9cbe96dc547f84c49a1d62f05ce8becc32. 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/QZHN92131600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615228d4e032ca389580ad6d23536af6819c74a6d731b8136443dfc934d3e36b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAFN2111707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146f2e323fc18cf05e7a2c7f435b6b6e9af9397e600ee16e99cb8970b1012549. 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/TCAFJ2187357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477439ae989fbbe47c8d94f944f22adaa243a0c5b11b6bd4e420c7bf5690b0bc. 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/QZK6P2184765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab857b6afb9772ef3da69c8f420087d573474118ac7467d365f8fbe6a28950b3. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZK6P2184766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ced4b0c0d6c075e990e9aabebddd772e10a5006c9f66dd6d97bcf21d72ef98. 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/QZK6P2184767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1159a0719b25f03eeb9046445cdc535ce16b41232e4f1b44780fbc73201e4444. 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/QZK6P2184768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd87747f0fd348f575af9499211f75ce25e1fe62f42ed0aa1f5f0ea5e37b8d2d. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZK6P2184769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e1f0629b4d351a50d8eb7f33d9d6f7d9be45b21bf925c4b29a06c9039745add. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZK6P2184770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dfd17c9eef9bb7e95a4cad5b1124a7a984d53af8649a3e1ade07d57c56e69c9. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZNWZ2124607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041367174a6e14a33c32ecb924db7aa71271ae0b4bd1722cd7dc019e33ffdfc3. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/QZNWY2182282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba5ad45d88ad02450e3714168280ea01b9a3f567bf5e7a95a0f10016885d283. 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/QZTAS2198878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72bc46edceea9bb02d445ad5c966940d8cc1958257ae23c18b26eb516b0acf2f. 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/QZDA42230561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01441fcd3fc684b6aee3a58e139341a9a3e7970f476ebed4fc16383f0171940c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZES72261241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97915c6e97e50b6628cbda3011f1e57a0c2d2ead9f013cf40349e0d0662207de. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZZ662301250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d4c9c4df7a9ccb5a7b326a51e9297f0c2d1ce5412090af31d25d9389ca2aed. 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/QZWDD2420491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea80a1c549c1ea7dc3614d29815c44a1376426331350391a9cea79d2389b5cf3. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZZ8A2418472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d4c9c4df7a9ccb5a7b326a51e9297f0c2d1ce5412090af31d25d9389ca2aed. 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/QZWDD2420491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea80a1c549c1ea7dc3614d29815c44a1376426331350391a9cea79d2389b5cf3. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZZ8A2418472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d4c9c4df7a9ccb5a7b326a51e9297f0c2d1ce5412090af31d25d9389ca2aed. 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/QZWDD2420491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea80a1c549c1ea7dc3614d29815c44a1376426331350391a9cea79d2389b5cf3. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZZ8A2418472.