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 0x8fe3d2030958c36bfc6d601da2aac312b7c7e64833c921771a58e4d98ef90bc7. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/697b6016-c2b2-48e0-9ea9-2e91e4d4948e.json and https://artists.proofprofile.net/proofs/artist/697b6016-c2b2-48e0-9ea9-2e91e4d4948e.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 0x2c5846bd9fd63c77305ffe8c3cb197f462d318596f183d00a22f46dbe6d198e9. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCADT1832265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03acd9e90da6e4ee7a249f25f12083d2523624201ea53180875654bb674692e. 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/TCADT1832277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9b1ec78185fc2765d23ced8394bea75075aa8a661a8edff72db39e65e6b7a3. 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/TCADT1832298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5016149c5eb9fa209a3504f7499e243d7cb212f56761692924f0bff0da1fcd96. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USA2P0610316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30482062fb9984ac7b749d44c01611f9012a77758d926b3ab833aa16412fb053. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USA2P0610317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25294d82baea8c64c3464ab7c0f5eb72ae712b8fbf1feebcab2555cb48dda3f. 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/USA2P0610318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0954914258d6458bbe8ff271108b6dce6d605bee45fbaeaf4b3ac17600269b0e. 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/USA2P0610319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8834d16cbebebe61971fc49dedbb89c7e8dd0b35501cadd9d79ef66f54852671. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USA2P0610320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf5dde33d0119409c3a05bf387a3523fadddaa5ffcb5069205bce3310fcf199. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USA2P0610321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff62470aab68413543b1f0699d5d9cb6700836235879e39059c70d6efb8646e6. 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/USA2P0610322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e9973430624c58aae2454b147ee88251e088be7576ed5645298d6a4e74424d. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USA2P0610323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cfc18f2c59845c0abb85c6eec4b1165d1668cbcf4cfb08911ad24042603a65. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/USA2P0610324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd784a1a6ef30661a7017ec3770daf67a5981ad9388b9215b1e1009d09d7dd341. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USA2P0610325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738d0cc2f73ab4bb6991ae84613c113df70af170d9f41f3e888bef3d947903ba. 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/USA2P0610327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5848cc0f6b32eaf7f4e4a62959fe029656eb3e6b853cf7996530ccc31a7880bb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USA2P0610328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9982ff8c460c1cfbdc0767165407425f031bf94d9a1103273afef5f8d1c585f8. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USA2P0610329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22490a66fd083f936992c9d36b2fb01c3cc0724974d2cb67ceed143e2c592f27. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USA2P0610330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e4a58b6b0846df94502e1fd959f5d6e0826454dd38fad06506a6ad9f431b5d. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/USA2P0610331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015fa2dce196fb6a57a82f55a0e5867ce470bc5a18957bc7aca7528f34665b67. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/USA2P0610332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe81caf64ac6412a9b45d54a4523f25a16ddebc7d58eb0f8b3384f0a47dd735. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USA2P0610334.