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 0x3703e23c875dfe5dc7a76b1922edb11a1001c7ab3acb5ecdcf67bb79e0a09f05. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7f72f41-e29c-4d3c-a666-056d0d93dc7f.json and https://artists.proofprofile.net/proofs/artist/f7f72f41-e29c-4d3c-a666-056d0d93dc7f.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 0x5977b8659d947c4d1f540cb058852956ff6bce33af9e14c1cb9ff9c3a0c484b1. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/ES64E2206272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3df3a7f8cc5683999d97a5670804936e6fc92f498ac7f33b1a7912ea948c1c6. 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/ES64E2206274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64cad94c5822cd2770388d529fc1de70163e384de7e12cfccd4426290efb6647. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ES64E2206276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbeff045ef224da533cf47283987ba1ce3968f3b0374fb36882cef0a7dd9bbc. 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/ES64E2206277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6335c38566867291c5d2f7a26ce98acccc989766dbc6d2326ea1a0ca78d98cf. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/ES64E2206278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3119d388c5306edd6ff7cea67e5e6202756a38fe73fa26bf09cb1fa1eae7cda. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/ES64E2206279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814834e4615fae09adcf05f8adb76569f9ff3bd7a210efee56571e56644a93d2. 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/ES64E2206280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c880a231b239eee600dc816e953bb3b0aa86ee923471ef5c76e49ef90fe4c5. 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/ES64E2206281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9408224c9e1ed6cb2661a772d84dc4ad42298f70da3438a3fb1ee7f05c427c7. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/ES64E2206283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b422ef83c9519bcf37720f4009618a6540e85c62ff21f7257f43ccbdcf58044. 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/ES64E2206284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d139a50883beda5fe737b99fe7f686471c83fd2bd49018ec7d5dc4a117a5a0. 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/ES64E2205659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17a80bdcb3e683b98389543af1bd1fd1b4ae00a192cfc2d2431a9fe55c24c95. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/ES64E2312830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0ccc0b69cbb7fb2f9bdc799848c97e5e793adaaf3f6cf3a1ce5e4c5e86f2a0. 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/QZNJY2336989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab6486642e431ab711c08b297fafdcf8e9387c08a0f4f4dde317e142ce6f56d. 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/ES64E2303583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc55051e7aa344020aa07de1cde4c80c8b40cf191f52b7d0c36a470544e6dd92. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ES64E2303587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e21eed4738fa65c80af0a76cd4499291ef426d9e190eda9233f4ab57be4c77. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ES64E2302828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86a2d62c6f7e62fdc16d16ee0aafeab1c38ecfb04897238d7769bbaeb0eee30. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZGLS2347707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4556b64ad5678ac5bfb4058ec9316140e0c391e54f307c4f8c816497cb8f39c6. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/ES64E2300082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc82ce73d6f981b5ffa9ddb21adf5280431571f09b16021c3b115c97f952aa2. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZTB42357728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe041209c8348aa88db2f4271f1f1412c62e18223abe5edcb3a6a7282478aa37f. 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/ES64E2301225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7a9e3eb0af77c261428cc1583f914c67e487cd932d3fb5051e5955e4396a82. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/ES64E2301271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d81c6ff237140fc2572d2cefaf618378f621de92e2121bc544e1ce8177142b. 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/GBMA22095924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632b91afae8937d40b96a8938bfe98abaf3f9d9349b60b3a91b15f83b1a16184. 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/GBMA22095433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a57eecc7e5ea01784aac7db2a33349adb313293c65950d6412e5665f136e45. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/GBLFP2040494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff58329ead2690baac92440bbe496f3e4d3ac764523d6c90d73b31cd54aa12f. 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/GX3Q92464333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d81c6ff237140fc2572d2cefaf618378f621de92e2121bc544e1ce8177142b. 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/GBMA22095924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7d3eb72f9b9505495c5d551bd3b4be35090add1cde627213264323b1e2b426. 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/ES64E2403013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54857905c712db0cb2ea045e3d0225ab70a11945b69d00426405a25779fa3d60. 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/ES64E2403014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d19386e07d77a248eaa85669c6d14de184a62aa50fc603c0e299fb42daaf1eb. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ES64E2403015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ffa2a2f9fcb21e91cc55d48ec77ec1592cfa7821f425d15c914b4bf2a5c692. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/ES64E2403016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00bd2b7b01c9d854eb20a4a89ecf13b47ab7ebe5bb52967fb15ca5d726dd747. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ES64E2403018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc7507c9953ba0979a72c2610dd1691d9a3f65319b5c6153aebfae602710108. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ES64E2403019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85101ae305522ff0920c705d5e723dfdcad78e15f9798cc5109567717e260fd. 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/ES64E2501854.