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 0x84efa9f84797a8ac756c090f27809165b5dcd517d66cfa2331607c0a4c5de7d0. 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/287c96f0-d6a1-4ebd-b897-44b46e7180e9.json and https://artists.proofprofile.net/proofs/artist/287c96f0-d6a1-4ebd-b897-44b46e7180e9.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 0x224f86234072011b43ce89a316e5ddd15951b131b297abc502d8367ac1752ffd. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USI4R0906898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27d0da37685c121e7c4a250ae208fb6e25b10d867ad5a58da740e4f3f52f288. 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/USI4R0906900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f649e74c35d67ccc97fbadc692991954f5e5e66c288c58310928ab48a72892. 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/USI4R0906901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9fe13111000c6e616c699afd351c4cae5ddad0a176b3f282d8dfb27ce50840. 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/USI4R0906903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fdfbd128f36ac5e2d10b2ce80d1460729897dc51b3612c1150d158c7de10794. 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/USI4R0906905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe424ad537eb897255b4ac6668e9ca04f5409a945788c3b35efb6c206c60beaa3. 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/USI4R0906907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6aba2eb69ca52f8667931014b997837010e2903835fc8f250ae2ef4978bee05. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USI4R0904838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc22398dfb8c96368986399e40d39f43171a0be0850c060a03a271828ca33f0. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USI4R0904839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9147701409eecc87951a0a5f5b0234ce49b1eef29705656f71625e3591dcb78. 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/USI4R0904840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742d3e74208b5e3c37736b26bebb972125b39cd5f4d8eab33545dbe6d19d0e25. 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/USI4R0904842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cfa4756f1968713fabc6220b938e4293bcb61105fa6458d1c053c2ac3f70fb7. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/USI4R1224846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05714a6056a8f30d5a4eb6b61cd426b1192a9f6d887834a50770f7f3adeabbf. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/USI4R1224847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900bd77703b1cb0e85b5587c60196aecb93983d45647fb11999cfee4d4524568. 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/USI4R1224849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1339f553cbdcdc71dedbc9ad1ca0d544eeb5e746a916337e57c6830b061857c. 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/USI4R1224851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc923a00e0c3f98720ec8feec65194e7c26702dee4115c248150bc458c314f326. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/USI4R1224853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02b51654a000d2d0fa45f4fc160413b2b79d54bd82fd848844b8808cb5a66cf. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/SE4U51600204.