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 0x04b305541a7e2d7578ccf83b4c026850db8e467c886556710ff2224efef10523. 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/5f339207-5c04-486b-99b5-7f4cd035bd12.json and https://artists.proofprofile.net/proofs/artist/5f339207-5c04-486b-99b5-7f4cd035bd12.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 0xadac3748d065ec20d297ffc2114dad25113044a65d4203c1b1adc883286b910a. 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/QM24S1650146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd080ef734c7191df4c3e694709964150bd3fcc84d0d7819a188617eacb1d13. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T14:08:56Z), 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/QM24S1650327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb54d57740cf6c4433bbab7325bc348bb843b86cb9746f8fe16bbd868614cc9c. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T11:07:09Z), 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/QM24S1650328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe1f531f2ad480d01a9d4a278f0f2db453fdff6b84b5bd9b1c9ccfbaefeb4ad. 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/QM24S1817955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6bee56a03d783d967d55f20665a2846cebe916080c748393498f76fcb103810. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/QM24S1924902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe1f531f2ad480d01a9d4a278f0f2db453fdff6b84b5bd9b1c9ccfbaefeb4ad. 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/QM24S1817955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24eac48439582b67ab2998aa38e1d8c0e761937c119c8e8dd8d150aa5e338b4. 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/QM24S1836038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e44eb1c09b4c5323c10c0051f30772b021dafff9b1cde261a738da46d095e2b. 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/ARC572406548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9601a2169e4f79cdc8a4d8a6773db9eedb1cd30c27aeed6fad68124f6a5559. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-16T00:24:12Z), 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/TCAJH2568754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ccde5429024832878a27c4b4e6f10d5e10378467509547d607d0ab5cbf4e81b. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:54:39Z), 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/QZTRX2555205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0f41a7c36a0e17bb6f965fd0bc2f5b7271e7f045794a37fd79602cca95d41d. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/TCAJN2551060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08496bfa92edfeba12dc80d6beb5c3764e8d99b060f7b1913216e30b6600030f. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/ARC572502987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8b8a385dc674cb351f5f96975ce7d083b5c93ff77ec349cacf35eb515d7232. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCAJN2551264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9601a2169e4f79cdc8a4d8a6773db9eedb1cd30c27aeed6fad68124f6a5559. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCAJH2568754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8cc21c41506a8f4dc7a5516725c52e0af16d4229dcfa22d3ab7e6f5bdb6cb9. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T21:53:15Z), 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/TCAJI2547698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0374ccf0e00cd45e364b8ea46b1ded1950125a3ffcb88e3db9ee078276b9cd. 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/QZWDE2554514.