Portraits of Past was an American post-hardcore band from the San Francisco Bay Area that existed roughly from 1994 to 1995.(A very short bio on their official website.) The genre of music that they h
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 0xfff4727ce1a2d3dc9fa7aced524b2524431926363c2acb0e41cd59a61dc56806. 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/4b0b2cdc-db83-4a58-a96b-eb9d97e5f15f.json and https://artists.proofprofile.net/proofs/artist/4b0b2cdc-db83-4a58-a96b-eb9d97e5f15f.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 0x7e9b432eb852ae2e54ba3e299bf6fbf4fc386178e57c30afd8c871e5d8bc3113. 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/USHM90816103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f148d23ee9612a4d15b21ecf26f689045924c925096795f8f27819f6a5b17b. 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/USHM90816104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee78b70fc45c9a19b820fedf699e379662a6ce522804b23e67795f804fa4f66. 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/USHM90816105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91eea92b79b2f5ba2121e444f11adf75ebd6c2d46a450e9ad33c7b81007f7d26. 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/USHM90816106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f1e9a36964f0c29a850eea23a44f44703d07db08a92950efde75945d8ca75b. 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/USHM90816107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35010401fb13e41ba4e2b822d2362a520264a2590654c742bc6f6f3c5089d0e7. 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/USHM90816108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e66c5dbe1b48df2ec4a0d7b878bf060a741120f415b19b2b9b095224833a1d. 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/USHM90816109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00c162f1e26afa5e4ea29da12aa80aad01ee33a148e286df25f61a76d5a582d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:12:01Z), 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/USHM90816110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514aeaf79a9a57cb7b8f46ed0d0e94ce452e6689d429b633de0132799c3dc2c3. 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/USHM90816111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916be503d38da564b9f8cb98b5d4b8d833e20dadac989f5831ae2bcfae747f27. 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/USHM90816112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81644ee5b5b7f021f8c00833e1827e930c6484d369d4d57f0b9dc949e971e44f. 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/USHM90816113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c32be43678e7e38cc4b65c5dfd05adbd868d91adb3c42b2b84ffcc8bc8ee360. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:43:48Z), 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/USX9P0955047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a8d849fa1796db61a7bbda5eac4d588cae551d2bd152c58e48aa3d47ffa6f6. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USX9P0955048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbabc5f76c90dff2ac269a02c3153fd9efac17f128a1b84079095084f67c3dbe. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USX9P0955050.