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 0x6a43c2ee0127659a662e5bb51e7f53307f149f2e09072c493b74feb0e775d8b7. 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/697c7b10-3e4f-46b5-b1dc-71ddf016e1de.json and https://artists.proofprofile.net/proofs/artist/697c7b10-3e4f-46b5-b1dc-71ddf016e1de.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 0x1a96810f37dcb913916cc9e94116477c8a66633569fa14f32fcc81118a70c4ec. 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/QZWFM2363319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c612d34da09223ca7ded80c94f5146c31d1703c9649381679ca808545230d75. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZWFR2394067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3750459dac8f918dfe7210aa6a366e83e46b0032991bdaed619ab5cd5cc33d4c. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZK6L2455909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302f47f2159d1f1f6bdd4bd60c0710100dedcd5a29ab801baf2cc46e3460acbd. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZTB42427062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d773d0cd05692c1a5e14538d3abc131ce33b6f55fd22a6eb370a90f7abfbff. 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/QZTB82416578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc51a211d2cb127a9686ee7ecaf81a764b0a0d48793c00e547bf5fa625f48c0a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZWFE2408483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f0515db613d222eeb2cafca7ea185ff0c3d1b59351a8ac369162449764fbfd. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZWFK2440122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131e1c46c27996ca69d9062971d1c2db23332db4c3e2de13dede6efb79445379. 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/QZWFN2490801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367d07059d0a0bd8a66199cebc74111674119c16e5f4cda1de9fa9ce8696e073. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZZ762478408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ce5cd3bd91c3ee0e0b3cca0ca3c1968aa1f51fd0f7206b92e80fcca9f48f34. 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/QZZ7N2496377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76cf78a648614c021943b7849324261101d3984255b41b1bc6d38c063a6b6bf2. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZZ7Q2481047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48fa8d05115a9d7ff4d324c2bd5b7da2c37de12803166cc225dc1db33143fe79. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QT3EY2464773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202a62652f1b69ffb9ab489adea1898fc00f74e7ad1cc94c02fa6dfdf780dc7d. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZFZ32561394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1f5f5af8030e8ba5d7cfa7c25b00c5118957a22d3e5d1b3642734bf0793905. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZES62550471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc618db179871863bfd080a173f20039dadeabaf33c2d5487d0f911e3cb9f91d7. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZK6P2548566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2bc3aef3317b0a6cc474590648789abd6af4471700b69ff76699b188e5a821b. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6P2548567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219814f00b7f13e142bcbb3cf34e936192e4273ed3bc63ac8ccff9a7aa2fde14. 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/QZK6P2548568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e698a3113bc9d78669a99421d4311c4334c32ea1ae408fce0e1d5146824dd8. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZK6P2548569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cacb0e9c087ea6da5383f921a45b92cfc335e5c7e0385377c94981c593b611. 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/QZK6P2548570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3a07979d91023e58484e846191c774ccdccb1623c9b2fbfc929664506f858e. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZK6P2548572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ef93c6f066205bac5f6d3a671ee3ef24442fa6a78c3ce0b845476fd5f43041. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6P2548573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5bb3105d16d52596a7be4fc0c88352d7e2377f5531a5cdd99ecafc08878185. 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/QZK6P2548574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4577c555415ba5e6d3d7c908354cc777d32d495329a63fdd9570c4e409dd7a. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZK6P2548575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7922a3fa4b6a9c9b5356ec1b4557856e19733ac7a40618719833d5fc7cb83aae. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZK6P2548576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af0d15d4904c9c6e12482294bc7e53fa6d4cf8c937017eb4a3140e27a27a1b4. 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/QZHNA2525683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1372586dda2f8e1c4cb57a17b43299e9b11a040011dcdf362fee85951ebb11dc. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZWFW2556029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57eba2803ae7f066c872a4af5252785c142e212861a59eb3ac379d7d949bcab5. 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/QZTB22498665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6588d5e81ea6ff6c39e7d868d9bbf1da8e3cd2d61df5a5eaf776128042b1418. 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/QZTAZ2342292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb76c6f8663ee2cb15b8d3f3fc391a7878e4a7e0d6f3b083b09725acaa73fbe. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWFN2463243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fde0a469a86ead9eb33181a0b66765c4d53655e6398c022b80dc4db5beeae98. 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/QZWFQ2448757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c1c3f23c611f9c141ec25075ee0736e6e948cb4c62b957b2fd60ba36a52205. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6F2157025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f8ac4ac0ea65f640bb8e3e13426128edcb8c445bf5e3f7e8737cd272d30e02. 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/QZDA72446308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed54a58b1ae47fe80fd687779f24e7e4f9eec00b9e0e4c07d5fec09d995c6fed. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZZ792400179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dea259cfea416e7bc5793a4bcdd9a485c861807402a6dbd2b4620c35d1d78ab. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZZ792400182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f32b7ee2e53dc81ae1d2cde2bfe4bb06edf30a813274cb0c78569b38de7b1ba. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWFL2407824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387e962e0fa680f0bf870b8521d6f7b6fa9450e14b6f110355116d44348be3e8. 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/QZTBC2477289.