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 0x54a8d9b4efe085997355d80f8e40f774d13330ec53e32f22119b6d948359ef18. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aab7df80-5ba3-4669-8801-915e72d9586c.json and https://artists.proofprofile.net/proofs/artist/aab7df80-5ba3-4669-8801-915e72d9586c.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 0x6f2803bb965af92b7507366370591dd8e321100a66eddabc2cfb73c12aee022d. 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/QZZ8B2310644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55efc4157e98e094db2851bc10fe6d4da5cf38af4263109d07472fc3c8a59562. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T19:01:19Z), 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/QZZ8B2310645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4c5aeacec511e6ed8eeaef65bc54a06ce8d6fdf60786753419132a4e4c3286. 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/QZZ8B2310646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18b58ee108025c1d36ac88ea4b61867cfe93325265985a636b5516884c9ac89. 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/QZZ8B2310905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7597cd9cef8e19416b5cb1afb8ce2298af6abc109812938edbeb5a12f41710ca. 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/QZTV32570945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66bca4d00fde87e712252c7c68c1ce897601fbe5cdbc67a90c3168528b246182. 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/QZWDD2538280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5389e414aee53765a4687bb429b69c43dc800eb44cb59c31a8e1ae40dddc0992. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZWDD2538291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be7ade56be9c7b19d22f01eff0afee8900393b5d0a1566fc36ef9d0cae9c418. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T21:00:42Z), 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/QZWDD2538296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bc434a62adb4dae92def773872a501c1b9e2abe0406ba3511e19240273c529. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:02:05Z), 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/QZWDD2538300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a1fe7adf9afdf1ce439cdef2ff140c5ee13b075af4a0fb6511c671317ca387. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZWDD2538303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7597cd9cef8e19416b5cb1afb8ce2298af6abc109812938edbeb5a12f41710ca. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTV32570945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65459aa8a8a63f54968c2f7e81661c563044f82727a74554aacf181640981ac4. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZWDD2538307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98aca9c9b6bf9949204af7ddd0a7e4588ed835820a033b9f43450398886cc854. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZWDD2538310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bdf8596ca4db1bbabe36d9b6f328bdeaccb1b7d643c89c5b8409cc5afbed72a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZWDD2538318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180c573d22731325a9548929e2ee1a1aadea1a91a0cdb587b8f25ba8a5ec84ff. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZWDD2538328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4f9415ffbcff03002e78b51a26ba77480171f2340f40fe11c31daee9712964. 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/QZWDD2538329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf63cd2d9d36e595e1d83655a7992b182519d9dfc1b6b28437d8567d754bf8a. 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/QZWV32553126.