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 0xbaa7997d99910d25eda080c68caf1b19b2b44c4f8087a9038e18311547b1d6bc. 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/81488c14-0e9d-4618-8179-432186141b45.json and https://artists.proofprofile.net/proofs/artist/81488c14-0e9d-4618-8179-432186141b45.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 0x9e17a45146931b317a6e0c9e4fae2a830ef0a2bb2db53174ea41cf22803be1b4. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/MXE672000036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ab9b98ef6c6a04118c7a225a68c567c1443b774446154563d58e49fbb3483a. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZTRX2117962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85172b7e168ad6bc70a62e52e65d6a9a4a4d3f1ca9bc92ac9f938fd9c178aef2. 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/FR59R2115732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6917002574bc217753d6490104700680d9b7236423baad3acf430cc85e10512d. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/GBWUL2259798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e17a45146931b317a6e0c9e4fae2a830ef0a2bb2db53174ea41cf22803be1b4. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/MXE672000036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5b6863177c3ec2120711680d0f38c6a82aa53b4de2ff4264855ce2d9dfd788. 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/QZW9K2336015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3684b02137775a4dacc5167e2274ad8c214078efd3944a9a1a64912ebc022140. 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/QZZ8B2345062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd761a99828f06d93f10d47ec52ce830bad56dfb3360191d09c784e0230d52c1d. 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/MXE671800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2502092c6da80971d92aeb9160693f54478e2dd8555a6e6d657ef7a96b12b8d7. 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/MXE671800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d5d384f88e252c840fe0723046b09780a702553ee82f566cf274b1f780254d. 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/MXE671800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a13709f818d0aab309835f1fcf6b82553414378c809e389091e82c9b77a000b. 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/QZZ8A2391917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8b03fb74f93df69c4652264e747050074332b10531d1894414b2cc8c0ff3d0. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USLZJ2357411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75812df8c87e2e6e5b547703983c13729ca4eb545e9e57e91deb1d55a477e31. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZ5AB2048787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58c22e5f427564128f22f105cfe076882fe3f0b23ab9777a934f5382599bcb6. 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/MXUM72300216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37720047426669d1d66f7d5b22fe764d959a51c348ca8ecaf2c0fd353bafc905. 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/MX5332000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2b0cba13a93b0b224224bc9a3aafd4f710898e6be067e0953fb76baf449193. 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/US7VG1769228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1402c2f45334b644063d41347b806e918c5dbbcc6d9b942941103866a63e42. 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/MXUM62400165.