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 0xb30c9e22374545b6d23c280be3473b29c70ed06ec17f5b0ff084e7f7dc6bc89a. 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/da4eec09-505b-48d6-8a87-c6f9ccd984b4.json and https://artists.proofprofile.net/proofs/artist/da4eec09-505b-48d6-8a87-c6f9ccd984b4.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 0x7013da4fc40bc91e4c1a6eedb466947632a3cdfda8b353306ac8abc7cb502bfc. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/NLL151602401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9649191a8c83885828abde132bbc5b556c7d814a03562f7291086d74892f3a3. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/NLL151602402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b899ce95c913cd6907ac61bee54b14d9dae3673c9bfadc0f824ae594545a20. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NLL151602405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x544bde1eeb8005ea10ece94fa4af7803cb5c6e16e285c9bb8c1f86d862433ce2. 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/NLL151802828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9545b80ec15b7fe6533423f2e0d59e3fae2b070222a369d5cbeeadd0c24cf0a7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLL151802830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e33e5cfd43c54d2dd8fab88a8e5e4e0ba68b765d5b6d1c9977e912f5f35335. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLL151802831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb473d92dad9bff1e4ee681263977b206180f8f46b5e0058225bb4c4caeb96ca1. 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/NLL151802834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4923ea81e161dc3eb478cf3d93588337a56098148a9e5c65bb0c4292f9606c54. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/NLL151802835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb0a9aba3c8bf4a4d0fce21929f34fb296f4657ca2d55bfbf379a1080b519b4. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/NLL151802836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a24fb3958914fa22eeff2ab529c1408a651d2c2128518ae02293b59dc28b16. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/NLL151802974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8c754ac90bf80d982e5ead577503e2d821060c8f2ec2c93aa6a8e45f717a00. 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/NLL151802977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabacfbd3ea46a7d0f73c27bb6df3618442bb2c2aaba2a6a7150681aa9f4b14c7. Chain 2 (Bitcoin): anchored in block 958676 (2026-07-19T05:43:13Z), 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/NLL151802983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fafa4e8bb44e1d66b494dd0225cf657a8a1725b35af46586526ffa84e639c75. 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/NLL151903049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd825f2b048a5f88c3ed8a83dc8e559154bcf71db3fdc240e6b43826d45a1ff10. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLL151903050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60850f2d20ab2e5e3fbc61523eb613d22be277ef41c38b54bd7b5d94f7275f1a. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/NLL151903051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025ef9bd56aa26fd1a975cc72e4d07aee539798ef18c5ab6f2b6ae85d45d1358. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/NLL151903052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8d38b359853106c67f07d8b2dab80e057523c959b64f2017f84c5dc2746f82. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/NLL151903053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69ee41c98dd594f7cdc35e5d2a2db59b9c4edd692ba40eb7642a8c3341c7e3f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NLL151903054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a86e7a1c204812befc9f8ecde8b5c6ab9468595faaaac67bd154cf9695d40e2. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/NLL152003178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175d4b8905467916cc1e93306aaed95458a15e05cb15ffed8369935c4ab17950. Chain 2 (Bitcoin): anchored in block 957540 (2026-07-11T08:19:50Z), 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/NLL152003179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d00fce8d001b42a133cdcee2519775a1e5d7173b596c2468106896134a0f88. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/NLL152003180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2d19695a9ab26724e32524e1edcaceef9ed536f040edbb8575a72e077104de. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/NLQR51900001.