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 0x6f893e1072db9eb11d9bd8295a3885a54b3a3e25453a74379563953b7c28dbaf. 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/9eb5ad19-a415-4cf1-8050-05aef208901c.json and https://artists.proofprofile.net/proofs/artist/9eb5ad19-a415-4cf1-8050-05aef208901c.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 0xe06027045a948c8e66a2ef1b5261f8d77165a9866e109bff926a9f05166f9f84. 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/USUM71805219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165ac96d0530f0d35deb077e7b134ae709c74ef8bd5a9949d55af917d483299b. 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/USA2P2115653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912e2b64e7e8bde118f7021ee456efe6a5b9f6f0164ac3e46255011d0ec91a97. 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/FR6V81546780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c1b7157d98f3ac89cd5b507d397f46c5f65a2daf6002557ba4f09c9c942760. 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/FR6V81546777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8010e9f6fbc276e903e23d49d123af1514dcd6d4f66508e0f81bd5ba90e1a0b. 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/USUM71704556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046d9402b0a7e6d388780366bdec8fd5b5bf71fa70cf4c40292a525198dddd64. 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/NOAAC1100204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa1f697223ea8ddc73a627c83d8eb57abc6a141cd4f0f6dc08b9490d6783e24. 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/USUM71518657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46384ed1126cbfafdfe4336c18af4617cf9d3c6e8ca2d9bbf66f279d5999e49d. 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/NOAAC1200031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86c656591eca534d20307b7b5e121dc8245f5aeb9b296b9b3f614db43aa5f16. 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/USUM71604264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a7cf26e38421b6b4c6e2ba9d21825dc36cb0bb649f9383c01fd7363d9d465f. 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/USUM71609170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631841879c55ae90c5cc0ed75f4a9f3eedc9eb00e782db676f95c4b4054921c1. 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/USUM71608725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcadfb9d218462a6aacea49831ebb33e9d084af6d06279de7ef3bbb6d45d6e0be. 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/NOAAC1100207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eabbd4912639dde7f743d13beb66ab169365fcf337af976bb1bf63e9d528723. 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/USUM71403302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a5d44b8701080b72ea4b047781c245aec1edcd82c266fa76de29b3961554a8. 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/NO35G1201040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb0dce4b32711971f3a7db446f8db8de08cf4feebc3b558c985f682fe457a51. 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/USUM71704558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d3b31cd1e0ead844df9608eb9ed495f21e5c5839972f766f081c1687c4f04a. 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/USWB12201689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cde4b40bbd1a4852103886e66bce56809eddf1696b617a544829b0c1ee0c49a. 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/QZJX91900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cde4b40bbd1a4852103886e66bce56809eddf1696b617a544829b0c1ee0c49a. 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/QZJX91900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed60aaceb4f9b80c0f312054437f0afbbff4a3348023364b295fcde0bc964ac. 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/GBCJY1300135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b9981a5e10d77dc60c10d2c6321024d66d48c2cd4ba76cd47c159cfba654a2. 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/GB5P52200126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6308191278f8da93126adf403dd648469c0d5cb2179f5c589745cef63ca7fd. 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/NOW562300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162bda5a18f5311f2883163674f54888593c980bb3885c7f76eacf6324ed1422. 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/USAT21904224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0fca54bfcea577439eaa5605a73689872b33d6e24c35e41fcb5a03d0f817855. 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/USA2P2401009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d66693923e447427c85ea7a8076aee02561c33aec3b2bdca332967c533d1a4. 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/USA2P2351336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52aa81be163d5e21283eb62b1109c5c43601162c7fe325e85a8b87518767cb2. 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/USA2P2359116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e3945618f7d4b57841095d1f102b3ed6a1ab6e88e27f704bcb6a510078ab19. 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/USA2P2401010.