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 0x6788f7ecf1a55f843782c4426f18f7f81c8b26a8128056dc131b31492fa33f77. Chain 2 (Bitcoin): anchored in block 953978 (2026-06-16T17:11:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c4c8267-36a1-4e89-9578-1622eb99ab1d.json and https://artists.proofprofile.net/proofs/artist/2c4c8267-36a1-4e89-9578-1622eb99ab1d.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 0x00bd58a9e291eef99075d4e759e0e0c90e4576a3478f7d96012e9c2d1a0aa9c3. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/COA6W2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc03f166cee6c1bdb9d7d4b1aa574008b460f579ec476db85103fce9d957d7b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/COA6W2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe039cf0874b649783b4bc8f073664a97039d3ddd5bf65dd2efe458e1b789a266. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/COA6W2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3305437da77c831d08afe692664431423bed4f52ad5ea557f3e333680df186. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/COA6W2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6141a00934a4050b8920b5c2d07b6248af8dd3064b84eca09960419bc5f80a. 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/COA6W2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c0f22e9e2a60d4192fbbd62a1337e8831a42034caafcc5eede85abf9281d76. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/COA6W2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f703c4b420ca1d8bc3933e4939d31bb306700304474043acd3b0a7f5d985be. 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/COA6W2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdca7f8a12750ec478ba15b5fdb647dcb0dbc692fae7cd35bc6a9ead3c9b68a. 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/COA6W2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2b666a54ea740661b2223e7482fd9a7f1b268ac35879675e622c0426ac11ca. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/COA6W2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb40747f06098ac967d3205d10f22144e530608a05098aa1ab81b2c65e89133. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/COA6W2400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b866ab56e43dc98d55c7b4868b4cdc793d193236afac7506364670cb3b4ef69. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/COA6W2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc23226b6783ebd6afad5a026c4617ee9d319538110ef3c0f2d1d0fb4d3a857. 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/COA6W2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67dda6cb4c0a30736603ef668f5398add913affe45f806c249c441e391c2d2ad. 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/COA6W2400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e019dcc8b10d52998c5d237b44b588eeb1e9d7b7a727f8a488c871f10aef8a. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/COA6W2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5048f03f3e0df48c68a8ab614db6647c9fb21463a51f376222204e29b09f62c3. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/COA6W2400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8666b3fc1afddfef3c650e0744530b660fbb4f31629bd53a9a620e2ee6e116cc. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/COA6W2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc7a2b9c1548dd4597e4571dd9d32917d889c8c3d03f959158a37411bbd3740. 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/COA6W2400020.