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 0x793c6e73d8a72c708009fd841c6d13cbd9541a9a0db71c79e13982715c6a765c. 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/450a5c49-1cc2-49c4-9eb6-3e3f3e3895be.json and https://artists.proofprofile.net/proofs/artist/450a5c49-1cc2-49c4-9eb6-3e3f3e3895be.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 0xb21e1287482f2f179d0048b098aeff51f732279b83895f9335b48f07650ccf20. 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/ITK192100141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36993158ecc84deaeab3919d9e42a49d8973f752d902bdf3d1230c5d60626ab. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ITK192100142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968635304e9d710c19c1b9c5e1f81b0f2618093af8e863d890dc247301847011. 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/ITK192100143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732c388145a7c730da0853b43bc99bcfe56fa4fe3cd49d4b839fb59f0271160c. 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/ITK192100144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9dc7299fc97963e4b039305486f70cbfc3957fe3bbdff2b94de03b1aed8f14. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ITK192100145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4497a49e4349536fead7299b947942c5ca6b4c7a63a24e3b0584cd3f96ede090. 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/ITK192100146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b813e233bc24e815fcb814526389da3f2ae94bc17ddc7efdfa6ea45116906f0. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ITK192100147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539b3a39754800e7b373d5d74c86eb71e7210384c0bda2689a15c4cd50f4a08f. 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/ITK192100148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e20b6bca6ad9da9e641d1746e2e96af24ee549e34b0014023be2ef3b37e1166. 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/ITK192000137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b84b2d6ec6d2824c4e8c9cdaed2adacec8ebe02a1672a544ab98c44731bc68a. 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/ITK192000138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb38f52a338f9e8eb37ca2ecd48f2f6c297b00f0ba6c6c3b7e32fadb60630c3c. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ITK192000139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343fefb12709d5f626cf787c2c94a581edf961b79921d854d430b8e6a24069a5. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/ITK192000140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b7abe58c7d36226f803fc69225e9fa1282e1789213d8d92e3e368ce75172d8. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ITK192000141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9154c519f7adcd79521347351aa9dcfc7f6a4ecca4d877137b64bf3e22dc7e4d. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/ITK192000142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde77a2ebaa5dc220123eb9a7bbde316e389d60db3ae649e0ae0cb2c17950e11. 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/ITK192000143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147461b74c8e1c7c022078252bfb234a4f8baae7f68e79e5d812587d3c351719. 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/ITK192000144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb177386c9ac4d5200e97bddb92b4c9ad566081e6a90680a8ea6f5a1420bd3ed. 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/ITK192000145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ebdf39b9a4435a2d0a4e5b1fee260f19b4929d8e96a3c339945ab2f4aef061. 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/ITK192000146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b6db15fa35b8c93a3fec5d8606acada1a8c52549c588aaf681678f21a2e146. 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/ITK192000147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e428729f70704a8e8580bb8bba2511867dcb49438960e70cbc1ece877e7c57. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ITK192000149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc6d28c75c2eed6121d2bdfa4bd65a34f654c0193538ee68dd94d46d8fdb9f4. 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/ITK192400077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53df1e90c5f7e84312b00d186ca6bb4ba9bf34f9be8823b520f02978cb86a7b8. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/ITK192300047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc12228f46a0b6f87e2cee902e98e1a87bcb56f07facbee87a9624bec604b9f3. 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/ITK192300048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182dbf7fe4c817a2bfe8fa09159fd96690be03fd6490f519dc3df2a8dd02ba8b. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ITK192300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d629e7505a8233d7420003a925a37cd12b36b9baddf4e7d05d839bf14c460b5. 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/ITK192300049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df546fd9fa3518813b125c7eba8d9ad228becf1001f700a531faae4b72427f4. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ITK192300050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd332ebbb46c340c234f1719dbaa7e8e295800c580fa88167e53f4150d1a2ac18. 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/ITK192300051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842a4354b7bc3bc582a7e4eaa5d515981a5ec7edf51c8639267c0260ac51ccf0. 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/ITK192200289.