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 0xc7e72731e43d43fc2c5015f67d734b19c51d93664378e30b82469e93b46f1289. 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/a730331f-5dca-4579-ae59-14d1d72a932c.json and https://artists.proofprofile.net/proofs/artist/a730331f-5dca-4579-ae59-14d1d72a932c.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 0x4103e43ffc333471f3439037164764642d1344cffbcd1571c78cafd4b795727a. 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/CA5KR2105899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9000ab4f99a787d159c2b14802e03323f620f846367ea755974ead86f0b6e27f. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/CA5KR2105900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f813799c2f6acb5daca27702e15ddd12cdd87b7d29e335b7b26946a95d0189a. 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/CA5KR2105901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c11756942ce069cc27f399310177fbe3da1bc06c53988b5a771c93c5e70549. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CA5KR2105902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe140e666bd7842844e7f13518fe3256f57a5bbf4e0e58159e8649de4f00efab7. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/CA5KR2105903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b5f089b429786d276b78d6252d465f4510c4ab8f83b2674c4b972d1b24e22e. 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/CA5KR2105904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc82fdf6ba01e4a96e316c334fd296c91c1e886615c0c06094928bfe67b59db7. 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/QM24S1821385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56df93764f3a444daa9ed125a3d495cb43cd28a75bfa900658392c4d7b8312a4. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/CA6D21900239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cdea941906ed387eeedba437a18f23f16a5163b9225f5cb6c5445df178bf8a. 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/CA5KR2068684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d9f15cd47d3e8f760e3f158e0160cf0307f1d42611fb4a1b9bf3e901a7dbff. 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/QMUY42100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe05abf2751cbdfe0f2c39639e88d69089b494274c4a5efe79cd5e5542a74c8. 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/USA2P2331091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe05abf2751cbdfe0f2c39639e88d69089b494274c4a5efe79cd5e5542a74c8. 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/USA2P2331091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c017ce921d45e320d326d7bf466069b46c1e0da8f8d1d9d9bd561b8e16b49a. 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/QMUY41900143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2644ebb96ed5928605c18b5a86321791352cf8a75c756a6814ba4e6492cce69. 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/QZ8QY1800106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5eb65c4047b5b9b5fbfbedff98e9a0b2359e691117401cee5ad1555005789a7. 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/GBKPL2035151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5eb65c4047b5b9b5fbfbedff98e9a0b2359e691117401cee5ad1555005789a7. 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/GBKPL2035151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db6a71c8103657bda91db3e2bfcbb2b0154acbd8337f10934b1098e2b2044ed. 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/USA2P2161885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc242e87cc8367ecd25c4f96adbd42b3432c4186857fc1a94ff21e67b7960c274. 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/CA5KR2152194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56df93764f3a444daa9ed125a3d495cb43cd28a75bfa900658392c4d7b8312a4. 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/CA6D21900239.