David Zaffiro is an American record producer and guitarist. Career Zaffiro began his musical pursuits with friends he met in Seattle, Washington, assisting the formation of the band Topaz and later t
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8dad1dafb4c2385940b3afe903ce443c467db816cc4240a0be71839c246742. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c8501472-4591-4199-b7c8-8c73f41d2958.json and https://artists.proofprofile.net/proofs/artist/c8501472-4591-4199-b7c8-8c73f41d2958.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 → block OTSBitcoinBlock must exist at that height 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01165bff042c091df60da35381b41a6451ff987aaab8f8447c8aca4225a18956. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USACX1003121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3895340fbe8a763ce287827054983b2c27c44f564353de79b0924caddc96db. 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/USACX1003122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63ba9f70bfcaeb951cebf7788546e97fa62fb8f7314a6c11fc3b5e721c33336. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/USACX1003126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90744f23c6118d6e3b799c9559291135d393348035c7146a948f0006b45fe89. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USACX1003128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bf975e7723906e03464213ddeefb4fd0fbb3a1f66dbc416bdba11e257e35b5. 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/USACX1003115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7c69fc291155cc76d1dcc5fd2718960498c37d79a6c21b37a9a6a7198f9b2f. 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/USACX1003116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe468952b3ddd960dd33dd8997a9c7b25cd2862296c6b07c7a8b037af005d9e4. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USACX1003118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff2b8fd649e75ece408b15dcd3e1738d04cc66deeba0eb75a133453893747be. 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/USACX1003119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26c9d8f99149c7d6b4dcd3bc2fe4d6932b5cb9511c23182ff521cf30cf88ebd. 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/USACX1003102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de09e4602888ca4cd6764afe2bb3e1e6b057bf2310bb903e0fe531d6958c982. 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/USACX1003103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16a137e588e1ad77f7e13d062f93ec2b71c6e347129e2eeb59d1f6e22311279. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USACX1003106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b09cb1b5363ea98032c3a3e615876b0dafb46135951f5b5d8f76ade9964da1. 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/USACX1003109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9004b518c2dcdf8c8bd03129e4fc4fad8d2e0de78f0edfc02d1a35c5d77ec7e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USACX1003110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca0a540cfbf2fdae4f74111851987beee504a6e267a2c546fb82a4d0cce12a7. 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/USACX1003093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0888bab60dcd2bc52fd6af73b58ae62353b895eea9f6f3fc9c8dd385c6da58. 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/USACX1003095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695ad4128be072687aa903cab799b4d63016ece4d4da967d5ee8cb09e6eac443. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USACX1003096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85151ea11c389dbd6e8bd87dcb6f3be25bcc80227a833dabb4dce924b5513f0d. 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/USACX1003098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b05df0ea3119976581bfcbd15dd4a76b84dde8916aff217ae677f7d08db2da. 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/USACX1003099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39431af56e90c33d4388970105814ff04beb79da38c8866cead7bc1c97881f78. 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/USACX1003100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e08e96df130d3d95a58da8e62250777f8a27968c64b8de2650a2b1d50d9dc7. 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/USACX1003101.
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