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 0xbc732c35a19c8a51ef70606142b9475e2889f3610278bb0ae57c719310f274f7. 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/409f6e2c-81da-4994-8348-c04acc3b2970.json and https://artists.proofprofile.net/proofs/artist/409f6e2c-81da-4994-8348-c04acc3b2970.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 0xb08612c3c1086a4fca37ed93abcece7cd260567673c5b2998547610a4b48536a. 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/QZHN42401271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5b84fe037d32ce24b6927016a7a0f79e9876bda8b5da3d745dd83f39a49d32. 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/QZWV32419852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e47ad54be7c456243f83718d63e4e5a1612047828b51d6ad6c33598c5e8679. 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/QZZ8A2475928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1e5c712fe5fef9b4d283f85eeaaa6b5b0d76071b94d3e74eda498cc3ab2287. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZZ8B2431861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81440a01befa5dd8bb5b271557d8d48956ecc35030b580a422cf608cd2bf34d. 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/QZZEB2475451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d06aec7124af437327451ef9d2de9c0c98dc15714119a74bd880335198ddc1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZ5FN2511452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ea4bc195c47637962e00f7b2c6e8a9875fe11bb158a916a80f6fc456a777a4. 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/USLZJ2516269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6fa886ebd8872b30e71ca34fc0f67fcbec1ae1d17a02ad7c8eb640a4a9eef4. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/USBEB2510028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84bfcfbd5c7146dc0303ff501411ae500665bcbc8862812e86cebf55429efa7. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/USBEB2510029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5d2ece3588432a4c31a2479904e10ab6f0d4023d6508c31b623a87f5498cbf. 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/USBEB2510030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ecd616489351a31fa85c5715cf80f9aa446a90678f94985b5d5bc463f01f4c4. 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/USBEB2510032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73c802cfda707e1003e04540aa8046eb701e5f8045c11d65f05c279dc90f8e8. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/USBEB2510033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf021c63d5198e80804f5ffcde84c53bc20bba88fe6e32cdd0bfb98088e27d5a9. 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/USBEB2510034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf5b84fe037d32ce24b6927016a7a0f79e9876bda8b5da3d745dd83f39a49d32. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZWV32419852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f730c02e40e4886a6784789b4bbfc1b322d0e25458d09a333e581b9969befa. 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/QZ5FN2593711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353f96c071626cc5590de47c615d691ca6d6af40d02e1cada7ca3cdb1fb90933. 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/QZ5FN2593691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81a2b9194cea6ae430dcf7b2b7818927aa5cd442c72a262ae0a7c91f349998e4. 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/QZ5FN2593701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe978a05d257f17d6de7af0e54f861c44dcefca9d1be38b14ada78f0dee8fcc2f. 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/QZ5FN2579855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f730c02e40e4886a6784789b4bbfc1b322d0e25458d09a333e581b9969befa. 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/QZ5FN2593711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42080af1636b579534c750bb743e4fb3d171b9de0a6f39da017a626c61db4937. 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/QZ5FN2593718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9940cb9af5e3c83c701386b284b96fc887fec765004df791f021c33f587d379b. 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/QZ5FN2593727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420b3dfcb376ae2fe8e0104f2dd374f24180a3ff95fba60e672b743ec7c34977. 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/QZ5FN2593732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38f4ea7813e139896280daca81d8fee44d41d8c01e953b7da70847df4faf25a. 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/QZ5FN2593736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ef7583341280dd8e0c74b4b0ece8158014c7b11e850196c1cc4a7b49fdc3be. 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/QZWDE2582886.