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 0xf1bcacbd14d4a4d97c8d8c6f759d2c22a02b6223afaeaf8c456bbc6da2c92bb0. 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/c2d466f8-8352-4453-ab71-a49870036cf3.json and https://artists.proofprofile.net/proofs/artist/c2d466f8-8352-4453-ab71-a49870036cf3.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 0x146671f6e8cc4e575583b192aded394790727fd5d550726c5b7166931395a71c. 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/GX8KD2384284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6ec4842394922ab8ea902450a9d42bc54e02da86c82e24e9cc03c53abe6c3e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QMBZ92290177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de6626cb3ac95928f6911da637cba813db86d48df21f8dbf266f3f5d16d9f42. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEPI82324862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6b5dbf47c9cac721d94aba141a313611f0c8d9fe4c40b48023817a501fc533. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DGA072374640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1225aa83a41b53af6d9768ba31538c86c706659d6a4cd551f076c70b06f3a01c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GX8LE2309795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ea224674c05b649947095a8013b7a60e0b50243009940a99c576c2c4499e45. 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/GX8KD2319830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c79c39b32ced689b02742ec7ca6115edeb0dd50a7ce6704aaee5f96d0a63e85. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GX8LE2388811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4872071969dc336d5922155b5fa689681559588b08274956d95f88454aa1d6a. 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/GX8LD2351110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95887be18cd00f156ce75af6cc0964831b631cc8b6fd6471eb7cbd336c171ad3. 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/GX8LD2340353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de6a962fe2063b2a53d68d6229823ec4eab36d4429818a804923c32b9a50581. 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/GX8LD2349034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7dc69684938627b607f60b1c08b7043ac8b610b1cc9f6a3a754708ecb77e48a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GX8KD2384403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa950da740d567b290d8c78d3f5b93106069a535bb3de896011cb64c7351be0c1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GX8KD2328241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eeb5613c5a2d4db6263bf9e77178dd11e95d8ec5f2491879d5e2e4e0633c88c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX8KD2333134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9cc35bab3a6f9fe8dcb5f1952614ecccdf46670b8aefa045ff3d40dce5c46e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL2QC2100868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc3d9dff6f665db2f8672f735fd5ccfe97a7a5bfc5ff2e2e5f5818876ada1f5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX89G2372920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaddbc748a2c51609c0d6d89886d4eaae6b0336418b6d5cc7bf5a19f46d4e4f24. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GX89G2395069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9077acfcfbd286dae5ea8b061b8479f2a9a0a56f90b98837da01047df087092a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QMFME2249099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7314554776f94d1e6ce31cef144957a40a1be557ac9fd9a19ef2761cc18df1b4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM6N22293099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf028dbcda0260f1855de41efcfc1305dcae86ad2cdf8561284be4b4e7f0e3773. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM6MZ2268499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1395434e33a44f71e4fd934713fadc687ca18972148581119ed39d8819083a0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZS662279355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe217f5bd5803bbe1b71c9e8d61c76e3fff1353d4c64eaf29df8face3e73473a5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62402355.