Polo is a stick and ball game that is played on horseback as a traditional field sport. One of the oldest known team sports in the world, it originated as Chovgan (Persian: چوگان) in greater Iran a
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 0x08fa14321a7875a489fbee79650bd5e4c612e8b43762951435083ab7480b9bc9. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/670b940f-1fad-4de7-9302-d3800138e1be.json and https://artists.proofprofile.net/proofs/artist/670b940f-1fad-4de7-9302-d3800138e1be.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 0x565863d35bcfb798a24a626ac42065cee01bdcbab9eb3d9152c6602c3310cfde. 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/US83Z2480599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782330b90541ecaf4902e7185d48ea965deb4930095ccd2a9f5bd0e6cfd42797. 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/US83Z2483092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf99d77306e6036959e0c8b2cd3f7504d0dd41c52a3848fd0ec9ef864624e1c3. 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/US83Z2028730.
Nostalgia Del Presente - Danny Howells Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7a2a0b36ce0076f21ddbdc06923443f602593047a318b0c1a8f4c43bc408eb. 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/US83Z2480597.
Nostalgia Del Presente - Jim Rivers Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d98313c688b90c2aa88648d5b66747854e24be4501610f19589ca7115c6ceaa. 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/US83Z2480598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565863d35bcfb798a24a626ac42065cee01bdcbab9eb3d9152c6602c3310cfde. 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/US83Z2480599.
Nostalgia Del Presente (Danny Howells Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7a2a0b36ce0076f21ddbdc06923443f602593047a318b0c1a8f4c43bc408eb. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/US83Z2480597.
Nostalgia Del Presente (Jim Rivers Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559f73dd7639943fbfa582ce7d857e616f3e184635271d119fea3c6c32aa8ed8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/US83Z2463985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963abb094b06ccb4dbfbc6b7c35bc412abda72f2a066f47bc513a5db53b7b952. 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/QMDA62335284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc8427c27ed50f2524f1aba3a06734cca4d4dca43f09b5c0dbf1785dbc3209a. 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/DEPX42300606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0c8c7b75de71c9b645f8faa87bfa18cb8a33d8aaee85e98cf6b2763dc84aa2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:08:02Z), 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/US83Z2233520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a9f5336ec9a30aef0ce7ef64a6972a44548a150633c4e4f8c0342cf57556c2. 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/US83Z2215502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d268b5a7f442828e7338c0f59f012b16f98c48989c0bde7fa6e1f11066a434. 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/GBLV62131932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0944260a2799feb59104e0403d54e475b52e72a8b5eb2bdfe10d003aa5de8c7c. 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/GBLV62131935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe387d1d4a9e08b38214de916b581260bb4f29b52e077c4a7445be792b5aaadec. 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/GBLV62131938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cbdff9998ef885c0391b8db10274aa078630ad42803b8e89db6e6ef0455f19b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEPX42300601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a75dde1cea25ce9ffb143c3ae5a0b77cb00eb6888966ec1e7144488053030b0. 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/DEPX42300602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd334508dab893de42636d0be46f13bd0380fa81695909425eeef2982ead2ebcb. 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/DEPX42300605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b130e710254f9139b25b5d76a3e523da593df16d09aaae41fd513905edd428. 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/US83Z2231207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68677d591cb485158a7c5d27f36c86aef06043fa2bb775929c3b8e2772b37a26. 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/GBJX32264723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3871e7f78a932ed4d90e83810027252435e6c93c40d369f1741c8369abd5f87d. 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/US83Z2233134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4313b785620823b2f4da4dd445803069e7622ad36937e1a3094704d4ac39c335. 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/US83Z1933975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183a3948d9f27a024621c9a56598a536702ca5d9fe64561f30a1c000497b9078. 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/US83Z2230770.