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 0x3e2c320e734124dfcd15400b5d159ea04cccde7e6c7259c3054253189f180793. 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/8673c585-5d24-42ab-9f5c-3d4f61c5ca07.json and https://artists.proofprofile.net/proofs/artist/8673c585-5d24-42ab-9f5c-3d4f61c5ca07.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 0x1aa60195b7874feac24bc879336e9ba0979d2b01f68e197e567a28e8faa89122. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES5021500814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431257f931e5504ef1ae6dc66f7647efb59c35ab2cdcabfe5ce4fcc1a63945ac. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ES5151801969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1db11ecc860414232819b726d9f458c42d9697101017b7ad7e565a1984e6965. 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/ES5151802102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193e669a44cbef8040011ff832722badd6de005e3c2d87fa8aba774b52498c7f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/ES5151801805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1545bd1afeb1736edf35d007b668d044e881982bb2c5af4793fa6588f1d032f6. 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/ES5152001148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13eb2229d4fe13f6abab5898af1358e652b4f8cd36787687d6f7ec0b1b12419. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/ES5152001153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec087767b936aa81aa9aa075da345a67432c3c40b85cbeab4c990a2f9e19c52. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES5152001151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ada0866f740c50827593b27b44a35b02769d078759748e48016341f460191c0. 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/ES5152100509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423a1c6a692c44fcb40f0b2855154282fad2b4b2d24cdba8f11b34cf01159192. 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/ES5152100778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1545bd1afeb1736edf35d007b668d044e881982bb2c5af4793fa6588f1d032f6. 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/ES5152001148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97575c2d34d026015019b8c5e00c2d7db168c22ff236112143646e2c2a7f683f. 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/ES5152001149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6558393a2759a85908c9a240180cebfd802808658dced8a1e0b7805d317639ed. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ES5152001152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec087767b936aa81aa9aa075da345a67432c3c40b85cbeab4c990a2f9e19c52. 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/ES5152001151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dcee55a016aa706e38641a1ed4f796e326823168905d2ef68fc0b1bf8f5be01. 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/ES5152100779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb2cfe8f402c98f92c13b29a59af4604b4675efac55a95c2c2f12588ea23386. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES5152100780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d7006efd2dc169e155b5a754714414c5c0e9de172b394c4210d7e707e43742. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ES5152001155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13eb2229d4fe13f6abab5898af1358e652b4f8cd36787687d6f7ec0b1b12419. 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/ES5152001153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c0136db8093d5d99d958a29954baebd6f3f4e7fbd8ce3269974c2dbfe0bd45. 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/ES5152001150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ada0866f740c50827593b27b44a35b02769d078759748e48016341f460191c0. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/ES5152100509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36dc285539395f05063fde96db9d4ad07134062b5f6a6d86ed5c3716166f7835. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/ES5152300973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e352364ab43538f52cecb48206011d4948cf02e9d8e2afcd51dc633d86e2db. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/ES5152401167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf039306125a324a6b4abc91b3fb47e8a330a17e07eac3c104596f3590fb1c83a. 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/ES5152500628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e02dcccecd90b3a85bcd14d32c8ade8a6320cf6b3971aabacdfb40926d270d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ES5152500954.