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 0x6fb8c7dceef6b04160b28ee776ab6b293fc08f689da3dec2db75acd393c1c0de. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7503d1ee-2eb7-4f0b-a673-da35a9d9feff.json and https://artists.proofprofile.net/proofs/artist/7503d1ee-2eb7-4f0b-a673-da35a9d9feff.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 0xaa5c4239c1eeadeadfe6b74e4ecc5ad46278ea40a1253d4b528733e7ee099992. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7S2519344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fcb789d2427c6b08dbf90c57b47c43c43f174476edcef19e1f7be1ce773889c. 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/QZZ7R2505105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d33d8451b7ea20f3b447439c0688bbd76ea79b27e8632b4f6fd0834f57d668. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZZ7R2507878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e030ffe90bac4012afe9a06d650499bbc049ef9eda32f118a023c66634f3e3. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ7S2504574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003f8cf544dd89c36bcd8f970d90d80babea621693195510e7fd7cf3de2e42c8. 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/QZZ7S2504575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3a972c4c41373a9b1753cb06c87087c25efec8329fc8b6fde547370c9383fd. 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/QZZ7S2529052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c687833900e722d8137da035f502a60801792fc3874f1f6ea450ffae3ae542. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZZ7S2526594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcbd40edc8d03f2acb16da2202a9d827f3c7ff90e947804d6cacc6723bc39e62. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZZ7S2529085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bad1dff80f6c20b538b6096b3c385d1e6ba09a402547d960b0e09ac65328d19. 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/QZTAW2340029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4648ff4566a683248146f817700fbc7707578a129e44719e6b0a4b6d98a378f6. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZTAW2344277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedd01de5758faabc44ead022f560380ae6295751b024b915f1fbb996957aa99. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZDA52450836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3141560af9a12df64bb99d964515fad2fff5c26e7c4c48db67628fc174cddf. 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/QZRP52464951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4519c2a59ce45c3442b5fae8b83be275b2699053daa8e195b7c45a0b89d110ff. 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/QZRP52468652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aab8c974bb31a9543e5a46e3a8ec70c71990da31676861359010a58be8b32ff. 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/QZDA52450833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0148f72f613570e60959d3bacd320ea14c4193c565546012104db0aaa6f7e768. 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/QZFYZ2457323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d95ebfdc3450b469b82d3dfe30e61c2fa6b4846c82b14ba735cc37f7cef844. 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/QZK6G2516066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f65c6e1a01ae70d47ad9bb2df75d0088907e1851bdabc3a5fcb029826bdf02f. 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/QZK6G2514410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0087250607c890ea27bdc4660160f350d85194e5ac2db3591288a4f6eb6ee8d. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZK6G2514381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2986845644d54e6f83f30b7f02cd10c61f734785c153c0c1bc8d63308bfc8a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZK6G2512151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1e804b6c776125d9a203e20f348897f68569b327a5241f1acf0ae3821020b1. 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/QZK6G2516063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44eb616b660eef869ac756395b0d9e8ff58d03e07c26786415aa3e31686915e9. 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/QZK6G2523432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4d93675227629cb17a7a3c116946507dd46e4941fdcd200a1df2b74c372621. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZK6G2514389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9976cd0760aa8b57c6c00de4bc499d8bda5d747d777b39b06c7a14a585c6b983. 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/QZK6G2517647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd193cb92f691df553093e753252ad6ff4b73b82978982b8554e40903452ed7eb. 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/QZK6G2512139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2fe0ac4419ff506a029374f053b1228ca6d51d926cf95f4e056ea467a871dd. 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/QZK6G2514409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893e946090ac41870d22edf89d435f73da6e59a4c1bc144f3cf965bd042e30c4. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZK6G2519009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e66a6001f0e9febaddfe268c8698f6d41087f461f94aa8a4e4588a33f2d1da. 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/QZK6G2509908.