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 0xaeff253164a98100106fbe980baad122da46dc96b6a9eb83f378106f0bee8b2c. Chain 2 (Bitcoin): anchored in block 953695 (2026-06-14T21:42:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7255a0c1-9f98-4d21-aef7-3069b6818518.json and https://artists.proofprofile.net/proofs/artist/7255a0c1-9f98-4d21-aef7-3069b6818518.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 0x74ebb21cd0eb92630ec9a7987f796ef1f79625f7e0fe30b07bb4e2c8f2218bf6. 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/HKC372464096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f3379d704b96d1b0b3e55aef709e142ce54740e1c0c482ba3174226982d2ab. 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/HKC372528447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ddecb38f01355b9e810c58ffc9cbb31c6fdab13450adbf9221fd48b827f8fb. 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/HKC372528448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9ca3596c868adb2f95fc95dc9bcff38fbd4678e83fab780f782937f3a5df27. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/HKC372528449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3fcefe85c913df88116041fe272937956929f4b2411448b1b173c1c2727ec4. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/HKC372528450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53ee28de549401de8e78d4baf3c2c8a0d2629360f823a7180f4b99d010c6cf2. 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/HKC372528451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2965f9610efb6aed956b6128b74faa569a4586f13094fc8771e483a2624ee1. 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/HKC372528452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82eb58cbcb768bd4aeb9e56370517d07a5d1d71e3916dcdb318cde5b6bbdc30. 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/HKC372528453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ba7e26fb3d09aca40a539dd708ec7427a88e8f96f24fa463670c279dfdc96b. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/HKC372528456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eb190007b8eda6bba19b0e89a794f2432c0aad975be9cf668fccd254f065d12. 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/HKC372528457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262dda62118b117569fcd079fbed7be96e486f93101613d9c3cc54a22e99fc42. 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/HKC372528458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412c844590d6c1b3d9022067756722faaffe96e7fa958621eba29211c0526cbf. 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/HKC372528459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2443978f0106329cabe1b273035981a609a66186e119e295578fecd6404acf4b. 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/HKC372522844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ee35c713ae8a0faba21de0dc917cb05b3c8fbd4e1a2690332aa88cc3340df5. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/HKC372522846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70113652196602f597417866d895cb390f4bf774ff50ae47aa5ed65c44932522. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/HKC372522848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f70a9ee38d537d872a1360c1ff0d2177aa072e39663302cf08cda1866953c4f. 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/HKC372522849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5786d0fa3fd5082c404958609c44c2274ff81f9b135b8f69a215dc74632c2da0. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/HKC372522850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2791d82de6b24ddc679f8be0b7bc8d68f62e8be7c1d2101f3cea8cc3f913efbd. 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/HKC372522851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bce6d8d8511e4a6c070567bdfe4ee0df48ede44997046b31986e34bd07fbac9. 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/HKC372522852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c6e8c697874306ee5d522c11c6cd86c76211a555270c842677c99bda64528c. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/HKC372522853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a2f7f22016006d0df63e92b5a8f50547a4ec3010c6c05368be429fd648f6e6. 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/HKC372522854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00dd5b0e2dbbfdefb9f557b266a55949a44503606ab099a72b3f11c2366d5ca4. 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/HKC372522855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5412e823a846c57c2d5b2aa244e547a1425b8147240fd1b4bf60af6fcbab08d8. 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/HKC372516336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d81c7460775df4e9a91b11bc761691a98c09b65472a8ca6c65287f00f36340a. 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/HKC372516337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea2cee9865769234519a1e8658eda4a06b692e02c709cfd712fd99a326ab980. 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/HKC372516338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2873390414b494e9151f5961bff68518b24f85b2b8434fd590b8c4a32a20ab1d. 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/HKC372516339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe716e6be62379026d37533bba71772a3ea1f3ce846687fa6619dade8c3ccb93d. 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/HKC372516340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6926a468d8e254d2e91431485b32eb21057bff8d322f3bb1ff6cc713e27367. 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/HKC372516341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af03373d617c078b88a9b13f4899ef901667d944c88d108c8862647f6d06b34. 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/HKC372516342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a32e9c482bd51de1bb1d4d4e6d42caa3e471895de91579516d894da9c52122. 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/HKC372516343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1282ae458e140d52c4d797603c71639bd6ba92c30d4eaafcba239d11a77f1b. 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/HKC372516344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f3c7a22c450037e0b3376ce71812cd25b456884560fb618d9884ede8f9312a. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/TWU712401213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72542434c6d9ef72c75da98978ae6bab456a7536f72f5b27d5fea7c1a157f372. 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/TWU712303548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c3cc76543201012f305b9a31726605d861ff8ba9985fbc5cb6dc75728665dd. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/HKC372465176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090e425af5c6624f023cbc4b197e29969db522f1d90da16d5cda28e94b412515. 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/HKC372465180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63f1d1331c5c290409b30ef53f2339a66fab0ced94ba0793bbf22f8c6d8556b. 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/TWU712401275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4990c95032e1fc88be8a268d81a31d4891b72c28e848ab724182bfe2b1b84d91. 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/HKC372468108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3be5935b0b42640161b33f9074be80516d6dba6593ca3e506a8e0f0a7c0bbf. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/HKC372468099.