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 0xe399cb359501ef67b3672a5190815905827524efa70511228291d6f07c4db13f. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f548a6ce-0158-4549-bed4-dc24b6cae9a4.json and https://artists.proofprofile.net/proofs/artist/f548a6ce-0158-4549-bed4-dc24b6cae9a4.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 0x1610db93baedd38a3a90f1346b934421fe05bd1e7d46ed5b6dbe78db868f6570. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZK6K2255252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06dadcc71afbc12743373f39514037a05152b08a1705168c3e43719a6e04076. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZTBB2242067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860ae0edc9c2256fcb2c8d2d684cc3b03df6066b00eaf2c7bd3c2cd2c52da52c. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/QZWFK2381954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e157fbffbc078a1b4aa9b32a816625b66912c8eb791892762e11786c7a77c28. 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/QZTB82356389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac953693f5e971d667768d2546893be0798454d3b3dc7b70fd22b91a01f9e00. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZTB82356390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109f457a892987dbef203195efe751b54c0c2fd973f93681dc28d1bd2b8de73d. 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/QZWFK2381956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8873197b8dabda938efbb937557a2106ca51556ae4f3cd8e87710acf45f52e. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZWFK2381963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d78424594c9d1a0fd9371ec60b7af5d1ed41558f62c9c9bace40b7e2a2d919. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/QZK6P2464121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e85eb5a113bf2343cf9536c451c55d9534b0d643582c280a81602cfbd06b95. 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/QZK6P2464123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0941a663392368b380971bceece5167d0d466e221e3363f1d07fb14089019071. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZK6P2464125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa91ee6c943657ce0592cb9278b1f2dcf2927f46a15f6f3518aaef6979a40912. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZK6P2464126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1ac2729c18af33b865d8178fd44c7ad14211a19494eb0fb988ce93ca86851c. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZK6P2464129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f503f334cfcbc5a8773bac270ac56c3e28982cdca743d72815f64f7e58a627. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/QZTB52448728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b441277d85f29a6b3132ffb037ca5369397533fb75cbe05e26cc3c4d57ec0cf. 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/QZTB52448729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4175a49e0768b70234484504e75a99949007eeaeb15552fad558333637e993f4. 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/QZTB52448730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24516e8f54cc644011541341f41ded9f94e8ca95512716827565642ca7194778. 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/QZTB52448732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696327c31ad04488a3e1af14d2d23e9aac7599b7d0c6ba7fa56f9d58ba48de92. 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/QZWFT2448641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fb7968b81eebe82214c1180c5fd622a18cfe12d2ad23f500a38e0f1e75b1e1. 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/QZRP42507567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081bc2a358dbfe734882f1709e56fc9668ef588e16b8b97cfb07806b8fe4b751. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZRP42507568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7075a104e31cccee692180a3caafbfa40aa1a9866503c626a19b60d98a1282. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZNWX2597910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696327c31ad04488a3e1af14d2d23e9aac7599b7d0c6ba7fa56f9d58ba48de92. 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/QZWFT2448641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd23db74e378aff5ca105d8b7217552f84fb41a2c498219e258e5a4d26961481. 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/QZRP42507571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb21a8b2d2b1f1155794a4e3f90940597e7122b2033b8a55b87a501f2f52b91. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZRP42507572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x327ab4f578441e9fb7432f04c5962a6d754a2da916993b1b8e05aefbf3b727e9. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZRP42507573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8ff22d07b2765552ed354de17722561fca785646b41b112bfb0909d451fdfa. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/QZRP42507574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5409cb48acfdf00716a6502948d7f818fe995221f992c34d521dcafa20218fea. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZRP42507575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08f2bc9a419cf3685efaa1699ec615fa26657287b18fd5e795d4f3a426dea31. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZZ7V2516986.