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 0x15c57f3b91843c05ff4d45dfd9ad10653fca63dc66caf6eb8013bf57e0981334. 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/e9999c92-9ecf-4c3b-b9a1-d32569dded1c.json and https://artists.proofprofile.net/proofs/artist/e9999c92-9ecf-4c3b-b9a1-d32569dded1c.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 0xdd1b87b07a8201dcb169f156864b13830dcf02aec15837d4f0b31ef7c92e7906. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/CH6321400732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30e0cb27ba369756ffd3a61d12cbaef88338e2677c997ae7e42be74470592d8. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/CH6321402927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99b0b55e70c7ccdaae3ef43b54c76381c25df563d40b6ca220065b06b44962b. 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/CH6321400731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca84453dec6a926217ea436d5e07667cf02c173cf4dfb0fdbef93f17800f16f3. 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/CH6321402932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7406b103a9cb20482909b219529076f36774476608d777fd9368e12b26ed97b6. 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/CH6321400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a48ed4c79bafa51b950c0f9db87ceb6ef521c9eafd4e81f5f287a52d9cbe2d6. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/CH6321400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55839385b594c54aa502f2b86c77a7861626da2cb350d7b904b9ea0a077a813a. 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/CH6321403334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea824329c157b01d3ab3640c3bdf4f1088ddfaa7f48dbdb292a9ef9b516672a. 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/CH6321403335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659c789525e22b79799ec383ac4dd1680490bc1b85b5d5fbafcad5ec3fc1061e. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/CH6321403337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18a8723e5d1ffc851b89471a381d9909ea2b8ea5dfdb9737916d49eac74a4c6. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/CH6321400734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823726913bf4854b72aeea70f9f76629ee87c26911c9163e6f984b24d7136de2. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/CH6321403352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d9abea5766b6022d0dcde1f066d9c739ae0a68db2e0ffe51cfddc56eb0ab55. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/CH6321400736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be7862951464dcc8d3a878a59ed0fcdce2fdf59e430d807f8effd00bfaffa4b. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/CH6321403353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa047fdb4613d64e7ecf5878e649c70aca0de9345cdc200789f4b36632cee2d7f. 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/CH6321403354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f88871c26612de8622082ff6f1108607ee1293c08d7cae449a46418d6d0b6a. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/CH6321403355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef5eaf6829721cc214768e80279affdd447b08956cc7810dde31204e3e76083. 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/CH6321403356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa801d4c35f0b5875acd0f48f5017f6aa4cfa297669b179f200a34473b0604eee. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/CH6321400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad523ae375ee30b232883198a21257804e9f0e3448810771e151153816b4606e. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/CH6321400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e68543dd0b5232411873018c39ad1f97ee12d9c4218bdfe1f23030db4e65c3f. 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/CH6321400737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc5be0766b2451b6b9c34cfa54e82af12ef41a3214a229fc11b627bde05e705. 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/CH6321403359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610feda2e96c256b096f3b66a8a0acd5675d743ea85af11a0733faad53463df2. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/CH6321403360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61bacd04728a676b22f6c61accd728e94f4b01fe2b33b34b001b4e80db66e10e. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/CH6321400739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346c37c0e715e8b31cf01bd1dd9df6a69deb291fe88459d80b65d770bd73c77d. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/CH6321400738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ad8cc4a95e33d949b62c2064c3555f8b5fd052c397b625cff25117d4f00470. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/CH6322300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9bbffb8558f2d23dc945fe2ac76758bcf332ae705dc9a1f04cca1c100e53a4. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/CH6322400388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0310f234bfbd71aaa9802875b285cf6fc2c8767b03c768eee94e41f77aab81ff. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CH6322400389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb08cf53e26b4ff717df8b09e0eabd915c74191b37aaabf79f70f85f6a29e0c0. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/CH6322400392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd057e062240564e76281fcc7a6f26a0067a601775c84470a99d8a6ce178c1a0d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEQ121113177.