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 0x68a1f63d6f6c35190999a0c45d66c0801688167e493334124289215268ca6039. 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/20eb57c1-5443-4266-bb77-28b5d478ccad.json and https://artists.proofprofile.net/proofs/artist/20eb57c1-5443-4266-bb77-28b5d478ccad.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 0xc60feca825f727a46eb58e25f2c6e610dfd5f7de0216cfd59ceaac3582de6c31. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZDA42109229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70003a535bcfc6c26c6799be4fcc93906c3244f09d7d76fa0ef5ea88004f297e. 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/QZES82145435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb32d22d1e537dba99b74991f352bdecd81eaa77fd79bdc45f5e2e0fb821a8b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHNB2179558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15033713ddcfe69f60a62a15e13efadf9cc035c4193561f0a2ed695d7e7fc072. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6G2128294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f00d858c91ec2bad32117bd9d5a55b56e62fe21d67bfa1c7e8fc326dab0d17. 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/QZNWW2170099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9ebd8c44582ef04f6cca024b57f53ca856067195624fdd08bc6e021f19891a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA52280718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31033cba4274a158b98fd51e2f56a19ca234e6eaddbc81956198093bea869888. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZK6Q2268630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2173ee3e934d254a615760f66b105604e14c77a1b2dedc4be196895b6b411a1. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZK6G2240609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48408e268eed93ed1473433447e2f475c6a3795f5f9235f6f218efe01ccbe4ee. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/SEWLR2319401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47fae523b9eb68ff7948b8809fdc06b75603113d694eec3e8d90b96d8bd3ed7e. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/SEWLR2319101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06b6e6d36b2a4a8dc4631890a73debb0ac972db451518d4042896ae0ea3daba. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFZ22415293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45359a85ff32a6fbff9a798cdbda31cb268cd45a622a37ebe216c55219fd5fb9. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZK6N2437466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3cf42015a921d2bd91c1811f0bc8f890d236f3568a04150d9b2127685b44dd. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZWFL2404675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc90c8547907cd059235a4945c8c1fb10261fbe97125a5f4067103ec8b6b6ac1. 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/QZZ762470495.