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 → 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
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 → 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
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 0xad9d4274a47b65c5a85a48b32dab038362d71c1b8532c518bb1ea67c37102f72. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USACX1003124.
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 0x9055be4fbf8c8b63ee12574d22ea524b30cc88c7dda0175e8b45a18d7c5a6bbc. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USACX1003125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee3dbf3214cb84ab0cdc9b8631169df5f425b29b157c329badc6ce0a6fa38fe. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USACX1003127.
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 0x1607611a3aa1e5ca9c71d9327560a3764500dd45f0501d904b0c311cecdc021e. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USACX1003111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb800d671586fe56db957354adf8a1ec8e8565a9ca743d48dce2abd2e0293e509. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USACX1003112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c3f11e5bf25e6488348d6a685de9467bfdd5e273823353650fa3376ab33c8e. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USACX1003113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbddbcbc295ef3c202de5c19c4ad0163d6aac0276c4746c2f0291f08c796605b6. 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/USACX1003114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb04c319e28fac6fdc5b5b17f3c69bd99c9cc2e4b61fde40c6c663ce3edc8ea3. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USACX1003117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03bda528e8699db060836581377c4fb95f6258e4785464bd8b13c11fc1bcc10. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USACX1003120.
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 0x2acf57aa5a2852e702a64535bc40be7363d46ab54cb3220f3281ba1a1183d32c. 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/USACX1003104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7e0bd4d119ef9f3b49a0c729fee5b2e7f9d0fd99fc5593213b2b260cd20d82. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USACX1003105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b2b0926c1517186e374ac751338713d8d25b271579c7d941d0a10c79b32696. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USACX1003107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e00b891a414c01fa5324be9fb2e87129ab66332c754d4e7219851f77e3ac48. 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/USACX1003108.
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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab11c19b9f0f600e8654f5e214b4aa45e63849666e79a9c35f33e5ddb47ee27. 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/USACX1003092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74abbd8ea75f850040b372017e70e353e96c0750d4026060c492eafaedadbd5e. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USACX1003094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87ddf0b1b10539bee4fbe0ddc6bb9e5936a44022cee76fa71f28a2efb4a12d9. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USACX1003097.
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