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 0x848839246e125a69512f79ac4a1113087b102e8ab4d6847cf36621573465b881. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4539524f-3d10-4e31-ab0a-dcc823f9cbc4.json and https://artists.proofprofile.net/proofs/artist/4539524f-3d10-4e31-ab0a-dcc823f9cbc4.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 0x698d691f13ec84f6c773f5768c3c76db222667ff1430270c55ac46fa8b71c9e2. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZTB82415781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a66d99bdf4e12e7d044a687faf518bd4be55162643f0553f5bc9cf1f46162b. 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/QZTB82415782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6bcbf139e5ea87a7a1a01d608146a7141761a170f06afd0ba2a0c5a355db5e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZTB82415783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd961b0904db2a59451828b39dd39a960f0b516d87231a5cb6631a7bff69848f. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZTB82415784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5328378605b666f10914b1f6320bce18bbef19211157e126b66a83f72b509aa0. 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/QZTB82415785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89782414b6c8e50f95ab05684cdfb8a4d072093795893655a4c762f6019bc897. 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/QZTB82415786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45f998e6d08ef701d43a9b63daa9660e7b5c6aa395edffe22a12fb573d2b066. 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/QZTB82415787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb4b7317a9d78d8ca78243d4e80eeaf96ad4637d656aa406f4485b287dfb408. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZTB82415788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150ff06a153db9d9a07b9e6129a8bff7ba0feaaa39d737242c24afd741ad5ebe. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZTB82415789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b388f7d40dc0063b9da194270c9fe76e37329f91b5826842837720e6cc3588. 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/QZTB82415790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5120b67f7cb373af784333f2a5db887681f47ef7a9810decde73f2dd9b2dd8. 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/QZTB82415791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee254af63a28785f7394fbf31f9a2817f04936fabf4107a546555d0afc01378e. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QZTB82415792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84440d3eaabdf4d4f546602a4f29092651882126dafe823ab0df020cb290ad0. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZTB82415793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fa80735f8c7b74fb552be6c902f1779802a3d12dcd31025c66ec1f6eb7614a. 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/QZTB82415794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d04212e963fcf1f5d340e4c51ccaa75eb22f38a6d4bda89d8687d0e458ddab. 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/QZTB82415795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb39109038dd0f985acf1cebe913ab905d7bdb36207cea6138b8b99848786de3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZTB82415796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03dffcc762e0e213dc273160204626700fadb587ccfdf4a3a7441f0ea5cb37b. 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/QT3EY2479099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1488d052dc7ccc21ab376e4f19d1ce9555ef39578040ecdcb48d3b1b492ef19. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZHN82596200.