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 0x1206271cf61216a53884067cd0eff95358e3be4a4662dfab9a31c37e6caae7a9. 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/da64d6dd-05fa-4a9d-9feb-bd73bc210afd.json and https://artists.proofprofile.net/proofs/artist/da64d6dd-05fa-4a9d-9feb-bd73bc210afd.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 0xcd5d87fc886eba5dad80f5ff0b4a446489a8e6640eba9f35312d7449d618d8a8. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USJTQ0905280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0caaa10c4be29b48d178acdb2a416cde0d3522208b9ee08b8e295a6b0f053530. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USJTQ0905281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16781327ef473f3f07e5a060340de654c99071cb836ab5b6586bf6666d7ca52. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/USJTQ0905282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4086872b2b9e8082abda86017b2d61a498d253c134aceeb3133e9c22d6a22e57. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), 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/USJTQ0905283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc46fafbf918e3aaa45cbb709a85fd08c9a4df1224c7bf803b9ad26d8e32360. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/USJTQ0905286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85eb6082629ad886d9edbe42cb6bbafd8f84089885517d1a05b3a549e6781c56. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USJTQ0905289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4f21cdfd3bfab25985476c4b4ddaf925650ad259aa011793f04fedd07c652c. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USJTQ0905293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1ad7ec4dd0287cfb568a4e915973a32d353558ec59ef0df586de7bcb6dfb3a. 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/TCACI1527710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d07ef133be020a3171efd035ed6df4fde39e680ded7f27d0bb813199768a11. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/TCACX1716435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486b7c33da22d65c646a58d80533aa4316e3ab72f1caa350862e928a5dc8b879. 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/TCACX1716441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72758086ddf7b512068389ffed87a0f53a4fad71a71efd47b9e0a083ad022b30. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCACX1716457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04ab0e889264ba8b76548048aa6df9991eb6bc955f68787ead7488240ec6583. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCACY1790539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4770e7d4f0f16c89ff0c8b6a353de98e4f3a385b030d2d6e43e0cf5541c5f7e. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/USJTQ1716779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e0637893e91520c07d7c5fb3fd484fc6845e511fc98aff5925cf34e027b379. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/USJTQ1716781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6ac129493d8d4c5023fa6ed0166bdd7f8d72ba2f248a173259d704b6a8706b. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USJTQ1716782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25632232f78539e334131357938a93700ed313759cb3117f79649fa2d2ec28d5. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USJTQ1716783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c796951b394bba994905d3a4926c5b3e7aeb92299d713ebd6759f9ff9da1a1. 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/USJTQ1716785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55681ae408af8b5fbf6415f7fc5f1a35380ae9e3f1270f252a1d1a764718d30f. 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/USJTQ1716786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeaa45b998d4d9e641034c8063857a1b0a85db88f4320b65bd06fa813a159c1b. Chain 2 (Bitcoin): anchored in block 957684 (2026-07-12T09:22:41Z), 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/TCADL1872264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142bf6517440120338d864e4c83276e9828dae1103648906c9cc49e87edc66d5. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), 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/TCADL1872266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745f05ed4497f8e74a60efc4242e4ba0ef0a6c8b74bb227809e06f13ec74ea0f. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), 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/TCADL1872272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c1010ada6112e0c6a6e68def684af6852d15f56748833e19377b030ddd983d. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCADL1872277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283154b8bcf7f71db8e9125951a59019bfab345dba04a0f0fcc1cda97b29621d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCAEQ2057194.